diff --git a/build.gradle b/build.gradle
index d2d6858c..1bc96e78 100644
--- a/build.gradle
+++ b/build.gradle
@@ -69,7 +69,7 @@ jlink {
     jpackage {
         imageName = "Sparrow"
         installerName = "Sparrow"
-        appVersion = "0.51"
+        appVersion = "0.6"
         skipInstaller = true
         imageOptions = []
         installerOptions = [
diff --git a/src/main/java/com/sparrowwallet/sparrow/AppController.java b/src/main/java/com/sparrowwallet/sparrow/AppController.java
index 9ae40372..14246546 100644
--- a/src/main/java/com/sparrowwallet/sparrow/AppController.java
+++ b/src/main/java/com/sparrowwallet/sparrow/AppController.java
@@ -290,6 +290,7 @@ public class AppController implements Initializable {
                     throw new IOException("Unsupported file type");
                 }
             } catch(Exception e) {
+                e.printStackTrace();
                 showErrorDialog("Error Opening Wallet", e.getMessage());
             }
         }
@@ -380,7 +381,8 @@ public class AppController implements Initializable {
             controller.setWalletForm(walletForm);
 
             if(!storage.getWalletFile().exists() || wallet.containsSource(KeystoreSource.HW_USB)) {
-                Hwi.EnumerateService enumerateService = new Hwi.EnumerateService(null);
+                Hwi.ScheduledEnumerateService enumerateService = new Hwi.ScheduledEnumerateService(null);
+                enumerateService.setPeriod(new Duration(30 * 1000));
                 enumerateService.setOnSucceeded(workerStateEvent -> {
                     List<Device> devices = enumerateService.getValue();
                     EventManager.get().post(new UsbDeviceEvent(devices));
@@ -536,19 +538,26 @@ public class AppController implements Initializable {
 
     @Subscribe
     public void usbDevicesFound(UsbDeviceEvent event) {
-        if(event.getDevices().isEmpty()) {
-            Node usbStatus = null;
-            for(Node node : statusBar.getRightItems()) {
-                if(node instanceof UsbStatusButton) {
-                    usbStatus = node;
-                }
+        UsbStatusButton usbStatus = null;
+        for(Node node : statusBar.getRightItems()) {
+            if(node instanceof UsbStatusButton) {
+                usbStatus = (UsbStatusButton)node;
             }
+        }
+
+        if(event.getDevices().isEmpty()) {
             if(usbStatus != null) {
                 statusBar.getRightItems().removeAll(usbStatus);
             }
         } else {
-            UsbStatusButton usbStatusButton = new UsbStatusButton(event.getDevices());
-            statusBar.getRightItems().add(usbStatusButton);
+            if(usbStatus == null) {
+                usbStatus = new UsbStatusButton();
+                statusBar.getRightItems().add(usbStatus);
+            } else {
+                usbStatus.getItems().remove(0, usbStatus.getItems().size());
+            }
+
+            usbStatus.setDevices(event.getDevices());
         }
     }
 }
diff --git a/src/main/java/com/sparrowwallet/sparrow/MainApp.java b/src/main/java/com/sparrowwallet/sparrow/MainApp.java
index 76802c42..ff3e7f50 100644
--- a/src/main/java/com/sparrowwallet/sparrow/MainApp.java
+++ b/src/main/java/com/sparrowwallet/sparrow/MainApp.java
@@ -3,7 +3,6 @@ package com.sparrowwallet.sparrow;
 import com.sparrowwallet.drongo.policy.PolicyType;
 import com.sparrowwallet.drongo.protocol.ScriptType;
 import com.sparrowwallet.drongo.wallet.Wallet;
-import com.sparrowwallet.sparrow.keystoreimport.KeystoreImportDialog;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5Brands;
 import javafx.application.Application;
@@ -14,9 +13,6 @@ import javafx.scene.image.Image;
 import javafx.stage.Stage;
 import org.controlsfx.glyphfont.GlyphFontRegistry;
 
-import java.nio.file.Path;
-import java.nio.file.Paths;
-
 public class MainApp extends Application {
 
     @Override
@@ -46,9 +42,6 @@ public class MainApp extends Application {
 //        KeystoreImportDialog dlg = new KeystoreImportDialog(wallet);
 //        dlg.showAndWait();
 
-        Path path = Paths.get("").toAbsolutePath();
-        System.out.println(path.toFile().getAbsolutePath());
-
         stage.show();
     }
 
diff --git a/src/main/java/com/sparrowwallet/sparrow/control/UsbStatusButton.java b/src/main/java/com/sparrowwallet/sparrow/control/UsbStatusButton.java
index 37db5a41..61cfd153 100644
--- a/src/main/java/com/sparrowwallet/sparrow/control/UsbStatusButton.java
+++ b/src/main/java/com/sparrowwallet/sparrow/control/UsbStatusButton.java
@@ -1,5 +1,6 @@
 package com.sparrowwallet.sparrow.control;
 
+import com.sparrowwallet.sparrow.glyphfont.FontAwesome5;
 import com.sparrowwallet.sparrow.glyphfont.FontAwesome5Brands;
 import com.sparrowwallet.sparrow.io.Device;
 import javafx.geometry.Side;
@@ -10,33 +11,41 @@ import org.controlsfx.glyphfont.Glyph;
 import java.util.List;
 
 public class UsbStatusButton extends MenuButton {
-    private final List<Device> devices;
-
-    public UsbStatusButton(List<Device> devices) {
+    public UsbStatusButton() {
         super("");
         setGraphic(getIcon());
-        this.devices = devices;
 
-        this.setPopupSide(Side.TOP);
+        getStyleClass().add("status-bar-button");
+        this.setPopupSide(Side.RIGHT);
+    }
 
+    public void setDevices(List<Device> devices) {
         for(Device device : devices) {
             MenuItem deviceItem = new MenuItem(device.getModel().toDisplayString());
+            if(device.getNeedsPinSent()) {
+                deviceItem.setGraphic(getLockIcon());
+            } else {
+                deviceItem.setGraphic(getLockOpenIcon());
+            }
             getItems().add(deviceItem);
         }
     }
 
     private Node getIcon() {
         Glyph usb = new Glyph(FontAwesome5Brands.FONT_NAME, FontAwesome5Brands.Glyph.USB);
-        usb.setFontSize(10);
+        usb.setFontSize(15);
         return usb;
     }
 
-    private class UsbStatusContextMenu extends ContextMenu {
-        public UsbStatusContextMenu() {
-            for(Device device : devices) {
-                MenuItem deviceItem = new MenuItem(device.getModel().toDisplayString());
-                getItems().add(deviceItem);
-            }
-        }
+    private Node getLockIcon() {
+        Glyph usb = new Glyph(FontAwesome5.FONT_NAME, FontAwesome5.Glyph.LOCK);
+        usb.setFontSize(12);
+        return usb;
+    }
+
+    private Node getLockOpenIcon() {
+        Glyph usb = new Glyph(FontAwesome5.FONT_NAME, FontAwesome5.Glyph.LOCK_OPEN);
+        usb.setFontSize(12);
+        return usb;
     }
 }
diff --git a/src/main/java/com/sparrowwallet/sparrow/event/StorageEvent.java b/src/main/java/com/sparrowwallet/sparrow/event/StorageEvent.java
index 985981f3..dd113fb4 100644
--- a/src/main/java/com/sparrowwallet/sparrow/event/StorageEvent.java
+++ b/src/main/java/com/sparrowwallet/sparrow/event/StorageEvent.java
@@ -1,17 +1,23 @@
 package com.sparrowwallet.sparrow.event;
 
+import com.sparrowwallet.sparrow.io.Config;
+
 import java.io.File;
 import java.util.HashMap;
 import java.util.Map;
 
 public class StorageEvent extends TimedEvent {
     private static boolean firstRunDone = false;
-    private static int keyDerivationPeriod = -1;
     private static final Map<File, Long> eventTime = new HashMap<>();
 
     public StorageEvent(File file, Action action, String status) {
         super(action, status);
 
+        Integer keyDerivationPeriod = Config.get().getKeyDerivationPeriod();
+        if(keyDerivationPeriod == null) {
+            keyDerivationPeriod = -1;
+        }
+
         if(action == Action.START) {
             eventTime.put(file, System.currentTimeMillis());
             timeMills = keyDerivationPeriod;
@@ -19,9 +25,9 @@ public class StorageEvent extends TimedEvent {
             long start = eventTime.get(file);
             if(firstRunDone) {
                 keyDerivationPeriod = (int)(System.currentTimeMillis() - start);
+                Config.get().setKeyDerivationPeriod(keyDerivationPeriod);
             }
             firstRunDone = true;
-            System.out.println(keyDerivationPeriod);
             timeMills = 0;
         }
     }
diff --git a/src/main/java/com/sparrowwallet/sparrow/glyphfont/FontAwesome5.java b/src/main/java/com/sparrowwallet/sparrow/glyphfont/FontAwesome5.java
index 4e66cca6..684e728f 100644
--- a/src/main/java/com/sparrowwallet/sparrow/glyphfont/FontAwesome5.java
+++ b/src/main/java/com/sparrowwallet/sparrow/glyphfont/FontAwesome5.java
@@ -20,6 +20,8 @@ public class FontAwesome5 extends GlyphFont {
         EYE('\uf06e'),
         KEY('\uf084'),
         LAPTOP('\uf109'),
+        LOCK('\uf023'),
+        LOCK_OPEN('\uf3c1'),
         SD_CARD('\uf7c2'),
         WALLET('\uf555');
 
diff --git a/src/main/java/com/sparrowwallet/sparrow/io/Config.java b/src/main/java/com/sparrowwallet/sparrow/io/Config.java
new file mode 100644
index 00000000..d1193dd7
--- /dev/null
+++ b/src/main/java/com/sparrowwallet/sparrow/io/Config.java
@@ -0,0 +1,99 @@
+package com.sparrowwallet.sparrow.io;
+
+import com.google.gson.*;
+import com.sparrowwallet.drongo.Utils;
+
+import java.io.*;
+import java.lang.reflect.Type;
+
+public class Config {
+    public static final String CONFIG_FILENAME = ".config";
+
+    private Integer keyDerivationPeriod;
+    private File hwi;
+
+    private static Config INSTANCE;
+
+    private static Gson getGson() {
+        GsonBuilder gsonBuilder = new GsonBuilder();
+        gsonBuilder.registerTypeAdapter(File.class, new FileSerializer());
+        gsonBuilder.registerTypeAdapter(File.class, new FileDeserializer());
+        return gsonBuilder.setPrettyPrinting().disableHtmlEscaping().create();
+    }
+
+    private static File getConfigFile() {
+        return new File(Storage.getSparrowDir(), CONFIG_FILENAME);
+    }
+
+    private static Config load() {
+        File configFile = getConfigFile();
+        if(configFile.exists()) {
+            try {
+                Reader reader = new FileReader(configFile);
+                Config config = getGson().fromJson(reader, Config.class);
+                reader.close();
+
+                if(config != null) {
+                    return config;
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+                //Ignore and assume no config
+            }
+        }
+
+        return new Config();
+    }
+
+    public static synchronized Config get() {
+        if(INSTANCE == null) {
+            INSTANCE = load();
+        }
+
+        return INSTANCE;
+    }
+
+    public Integer getKeyDerivationPeriod() {
+        return keyDerivationPeriod;
+    }
+
+    public void setKeyDerivationPeriod(Integer keyDerivationPeriod) {
+        this.keyDerivationPeriod = keyDerivationPeriod;
+        flush();
+    }
+
+    public File getHwi() {
+        return hwi;
+    }
+
+    public void setHwi(File hwi) {
+        this.hwi = hwi;
+        flush();
+    }
+
+    private void flush() {
+        Gson gson = getGson();
+        try {
+            File configFile = getConfigFile();
+            Writer writer = new FileWriter(configFile);
+            gson.toJson(this, writer);
+            writer.close();
+        } catch (IOException e) {
+            //Ignore
+        }
+    }
+
+    private static class FileSerializer implements JsonSerializer<File> {
+        @Override
+        public JsonElement serialize(File src, Type typeOfSrc, JsonSerializationContext context) {
+            return new JsonPrimitive(src.getAbsolutePath());
+        }
+    }
+
+    private static class FileDeserializer implements JsonDeserializer<File> {
+        @Override
+        public File deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+            return new File(json.getAsJsonPrimitive().getAsString());
+        }
+    }
+}
diff --git a/src/main/java/com/sparrowwallet/sparrow/io/Hwi.java b/src/main/java/com/sparrowwallet/sparrow/io/Hwi.java
index a8becb04..f3a8c75f 100644
--- a/src/main/java/com/sparrowwallet/sparrow/io/Hwi.java
+++ b/src/main/java/com/sparrowwallet/sparrow/io/Hwi.java
@@ -4,6 +4,7 @@ import com.google.common.io.ByteStreams;
 import com.google.common.io.CharStreams;
 import com.google.gson.*;
 import com.sparrowwallet.drongo.wallet.WalletModel;
+import javafx.concurrent.ScheduledService;
 import javafx.concurrent.Service;
 import javafx.concurrent.Task;
 import org.apache.commons.compress.compressors.lz4.FramedLZ4CompressorInputStream;
@@ -23,8 +24,6 @@ import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
 public class Hwi {
-    private static File hwiExecutable;
-
     public List<Device> enumerate(String passphrase) throws ImportException {
         try {
             List<String> command;
@@ -86,9 +85,10 @@ public class Hwi {
         return CharStreams.toString(new InputStreamReader(process.getInputStream(), StandardCharsets.UTF_8));
     }
 
-    private synchronized File getHwiExecutable() throws IOException {
-        try {
-            if (hwiExecutable == null) {
+    private synchronized File getHwiExecutable() {
+        File hwiExecutable = Config.get().getHwi();
+        if(hwiExecutable == null || !hwiExecutable.exists()) {
+            try {
                 Platform platform = Platform.getCurrent();
                 Set<PosixFilePermission> ownerExecutableWritable = PosixFilePermissions.fromString("rwxr--r--");
 
@@ -100,16 +100,15 @@ public class Hwi {
                     InputStream inputStream = Hwi.class.getResourceAsStream("/external/" + platform.getPlatformId().toLowerCase() + "/hwi-1.1.0-mac-amd64-signed.zip");
                     Path tempHwiDirPath = Files.createTempDirectory("hwi", PosixFilePermissions.asFileAttribute(ownerExecutableWritable));
                     File tempHwiDir = tempHwiDirPath.toFile();
-                    tempHwiDir.deleteOnExit();
-
-                    System.out.println(tempHwiDir.getAbsolutePath());
+                    //tempHwiDir.deleteOnExit();
+                    //System.out.println(tempHwiDir.getAbsolutePath());
 
                     File tempExec = null;
                     ZipInputStream zis = new ZipInputStream(inputStream);
                     ZipEntry zipEntry = zis.getNextEntry();
                     while (zipEntry != null) {
                         File newFile = newFile(tempHwiDir, zipEntry, ownerExecutableWritable);
-                        newFile.deleteOnExit();
+                        //newFile.deleteOnExit();
                         FileOutputStream fos = new FileOutputStream(newFile);
                         ByteStreams.copy(zis, new FileOutputStream(newFile));
                         fos.flush();
@@ -129,7 +128,7 @@ public class Hwi {
                     InputStream inputStream = Hwi.class.getResourceAsStream("/external/" + platform.getPlatformId().toLowerCase() + "/hwi");
                     Path tempExecPath = Files.createTempFile("hwi", null, PosixFilePermissions.asFileAttribute(ownerExecutableWritable));
                     File tempExec = tempExecPath.toFile();
-                    tempExec.deleteOnExit();
+                    //tempExec.deleteOnExit();
                     OutputStream tempExecStream = new BufferedOutputStream(new FileOutputStream(tempExec));
                     ByteStreams.copy(new FramedLZ4CompressorInputStream(inputStream), tempExecStream);
                     inputStream.close();
@@ -138,9 +137,11 @@ public class Hwi {
 
                     hwiExecutable = tempExec;
                 }
+            } catch(Exception e) {
+                e.printStackTrace();
             }
-        } catch(Exception e) {
-            e.printStackTrace();
+
+            Config.get().setHwi(hwiExecutable);
         }
 
         return hwiExecutable;
@@ -199,6 +200,24 @@ public class Hwi {
         }
     }
 
+    public static class ScheduledEnumerateService extends ScheduledService<List<Device>> {
+        private final String passphrase;
+
+        public ScheduledEnumerateService(String passphrase) {
+            this.passphrase = passphrase;
+        }
+
+        @Override
+        protected Task<List<Device>> createTask() {
+            return new Task<>() {
+                protected List<Device> call() throws ImportException {
+                    Hwi hwi = new Hwi();
+                    return hwi.enumerate(passphrase);
+                }
+            };
+        }
+    }
+
     public static class PromptPinService extends Service<Boolean> {
         private Device device;
 
diff --git a/src/main/java/com/sparrowwallet/sparrow/io/Storage.java b/src/main/java/com/sparrowwallet/sparrow/io/Storage.java
index 973b1c32..581d8896 100644
--- a/src/main/java/com/sparrowwallet/sparrow/io/Storage.java
+++ b/src/main/java/com/sparrowwallet/sparrow/io/Storage.java
@@ -220,11 +220,11 @@ public class Storage {
         return walletsDir;
     }
 
-    private static File getSparrowDir() {
+    static File getSparrowDir() {
         return new File(getHomeDir(), SPARROW_DIR);
     }
 
-    private static File getHomeDir() {
+    static File getHomeDir() {
         return new File(System.getProperty("user.home"));
     }
 
diff --git a/src/main/resources/com/sparrowwallet/sparrow/app.css b/src/main/resources/com/sparrowwallet/sparrow/app.css
index f516d79a..d821bff3 100644
--- a/src/main/resources/com/sparrowwallet/sparrow/app.css
+++ b/src/main/resources/com/sparrowwallet/sparrow/app.css
@@ -19,3 +19,7 @@
 .drag-over > .background-text {
     -fx-fill: #383a42;
 }
+
+.status-bar .right-items {
+    -fx-padding: 0 0 0 8;
+}
diff --git a/src/main/resources/com/sparrowwallet/sparrow/app.fxml b/src/main/resources/com/sparrowwallet/sparrow/app.fxml
index 0803d490..de7b1f4c 100644
--- a/src/main/resources/com/sparrowwallet/sparrow/app.fxml
+++ b/src/main/resources/com/sparrowwallet/sparrow/app.fxml
@@ -41,6 +41,6 @@
             <TabPane fx:id="tabs" />
         </StackPane>
 
-        <StatusBar fx:id="statusBar" text=""/>
+        <StatusBar fx:id="statusBar" text="" minHeight="36"/>
     </children>
 </VBox>
diff --git a/src/main/resources/com/sparrowwallet/sparrow/wallet/wallet.fxml b/src/main/resources/com/sparrowwallet/sparrow/wallet/wallet.fxml
index d678f205..f766655c 100644
--- a/src/main/resources/com/sparrowwallet/sparrow/wallet/wallet.fxml
+++ b/src/main/resources/com/sparrowwallet/sparrow/wallet/wallet.fxml
@@ -16,7 +16,7 @@
                     <ToggleGroup fx:id="walletMenu" />
                 </toggleGroup>
                 <graphic>
-                    <Glyph fontFamily="FontAwesome" icon="BTC" />
+                    <Glyph fontFamily="FontAwesome" icon="BTC" fontSize="20" />
                 </graphic>
                 <userData>
                     <Function fx:constant="TRANSACTIONS"/>
@@ -24,7 +24,7 @@
             </ToggleButton>
             <ToggleButton VBox.vgrow="ALWAYS" text="Send" contentDisplay="TOP" styleClass="list-item" maxHeight="Infinity" toggleGroup="$walletMenu">
                 <graphic>
-                    <Glyph fontFamily="FontAwesome" icon="SEND" />
+                    <Glyph fontFamily="FontAwesome" icon="SEND" fontSize="20" />
                 </graphic>
                 <userData>
                     <Function fx:constant="SEND"/>
@@ -32,7 +32,7 @@
             </ToggleButton>
             <ToggleButton VBox.vgrow="ALWAYS" text="Receive" contentDisplay="TOP" styleClass="list-item" maxHeight="Infinity" toggleGroup="$walletMenu">
                 <graphic>
-                    <Glyph fontFamily="FontAwesome" icon="ARROW_DOWN" />
+                    <Glyph fontFamily="FontAwesome" icon="ARROW_DOWN" fontSize="20" />
                 </graphic>
                 <userData>
                     <Function fx:constant="RECEIVE"/>
@@ -40,7 +40,7 @@
             </ToggleButton>
             <ToggleButton VBox.vgrow="ALWAYS" text="Addresses" contentDisplay="TOP" styleClass="list-item" maxHeight="Infinity" toggleGroup="$walletMenu">
                 <graphic>
-                    <Glyph fontFamily="FontAwesome" icon="TH_LIST" />
+                    <Glyph fontFamily="FontAwesome" icon="TH_LIST" fontSize="20" />
                 </graphic>
                 <userData>
                     <Function fx:constant="ADDRESSES"/>
@@ -48,7 +48,7 @@
             </ToggleButton>
             <ToggleButton VBox.vgrow="ALWAYS" text="Policies" contentDisplay="TOP" styleClass="list-item" maxHeight="Infinity" toggleGroup="$walletMenu">
                 <graphic>
-                    <Glyph fontFamily="FontAwesome" icon="FILE_TEXT" />
+                    <Glyph fontFamily="FontAwesome" icon="FILE_TEXT" fontSize="20" />
                 </graphic>
                 <userData>
                     <Function fx:constant="POLICIES"/>
@@ -56,7 +56,7 @@
             </ToggleButton>
             <ToggleButton VBox.vgrow="ALWAYS" text="Settings" contentDisplay="TOP" styleClass="list-item" maxHeight="Infinity" toggleGroup="$walletMenu">
                 <graphic>
-                    <Glyph fontFamily="FontAwesome" icon="COG" />
+                    <Glyph fontFamily="FontAwesome" icon="COG" fontSize="20" />
                 </graphic>
                 <userData>
                     <Function fx:constant="SETTINGS"/>