diff --git a/css/app.css b/css/app.css
index 39a727a..3a26177 100644
--- a/css/app.css
+++ b/css/app.css
@@ -41,6 +41,11 @@ button, input[type="text"], textarea {
   float: right;
 }
 
+#info > .center {
+  position: absolute;
+  left: 40%;
+}
+
 .toolbar {
   width: 100%;
   position: absolute;
diff --git a/index.html b/index.html
index 0ada198..64442df 100644
--- a/index.html
+++ b/index.html
@@ -21,6 +21,7 @@
             <div id="joystickArea"></div>
             <div id="info">
                 <div class="left"></div>
+                <div class="center"></div>
                 <div class="right"></div>
             </div>
             <div class="toolbar">
diff --git a/js/app.js b/js/app.js
index 144a466..958d8f5 100644
--- a/js/app.js
+++ b/js/app.js
@@ -15,6 +15,7 @@ var App = {
   joystickAreaDiv: document.getElementById('joystickArea'),
   leftDebugInfoElem: document.querySelector('#info > .left'),
   rightDebugInfoElem: document.querySelector('#info > .right'),
+  bluetoothInfoElem: document.querySelector('#info > .center'),
   gistIdElem: document.getElementById('gist-id'),
   scriptElem: document.getElementById('script'),
 
@@ -223,15 +224,18 @@ var App = {
       this.rsHelper = new RollingSpiderHelper();
 
       // XXX
-      ['connecting', 'discovering-services', 'connected', 'disconnect'].forEach(
+      ['connecting', 'discovering-services', 'connected', 'disconnect',
+        'scanning-start', 'finding-device', 'scanning-stop',
+        'gatt-connecting'].forEach(
           function(eventName) {
         that.rsHelper.on(eventName, function() {
           that.changeConnectButtonText(eventName);
+          that.bluetoothInfoElem.textContent = eventName;
           switch(eventName) {
             case 'connected':
               // start monitoring joystick movement when there is connection
               that._intervalId =
-                window.setInterval(that.monitorJoystickMovement.bind(this), 50);
+                window.setInterval(that.monitorJoystickMovement.bind(that), 50);
               break;
             case 'disconnect':
               // stop monitoring joystick movement when disconnect
@@ -243,7 +247,7 @@ var App = {
       });
       this.connectButton.addEventListener('click', function() {
         if (that.rsHelper.isAbleToConnect()) {
-          that.rsHelper.connect().then(function onResolve() {
+          that.rsHelper.connect({address: 'a0:14:3d:29:d3:f0'}).then(function onResolve() {
             that.changeConnectButtonText('connected');
           }, function onReject() {
             that.changeConnectButtonText('disconnect');
diff --git a/js/rolling_spider_helper.js b/js/rolling_spider_helper.js
index fd322aa..c074ec7 100644
--- a/js/rolling_spider_helper.js
+++ b/js/rolling_spider_helper.js
@@ -53,16 +53,17 @@ RollingSpiderHelper.prototype = evt({
     return this._stateManager.isConnected();
   },
 
-  connect: function (deviceNamePrefix) {
-    var prefix = deviceNamePrefix || 'RS_';
+  connect: function (options) {
+    var prefix = options.deviceNamePrefix || 'RS_';
+    var address = options.address;
     var that = this;
     if (this._stateManager.isAbleToConnect()) {
       this.fire('connecting');
       return new Promise(function(resolve, reject) {
         that.fire('scanning-start');
         that._startScan().then(function(/* handle */) {
-          that.fire('finding-device', {prefix: prefix});
-          return that._findDevice(prefix);
+          that.fire('finding-device', {prefix: prefix, address: address});
+          return that._findDevice({deviceNamePrefix: prefix, address: address});
         }).then(function(device) {
           that.fire('scanning-stop');
           device.gatt.onconnectionstatechanged =
@@ -121,13 +122,17 @@ RollingSpiderHelper.prototype = evt({
     }
   },
 
-  _findDevice: function(deviceNamePrefix) {
+  _findDevice: function(options) {
+    var namePrefix = options.deviceNamePrefix;
+    var address = options.address;
     var that = this;
     // XXX: we should set timeout for rejection
     return new Promise(function(resolve, reject) {
       var onGattDeviceFount = function(evt) {
         var device = evt.device;
-        if(device.name.startsWith(deviceNamePrefix) && !that._isGattConnected) {
+        console.log('found ' + device.name + ': ' + device.address);
+        if(!that._isGattConnected &&
+            (device.name.startsWith(namePrefix) || device.address === address)) {
           that._device = device;
           that._gatt = device.gatt;
           resolve(evt.device);
diff --git a/js/script_runner.js b/js/script_runner.js
index 06d550f..afdbe9d 100644
--- a/js/script_runner.js
+++ b/js/script_runner.js
@@ -56,7 +56,7 @@
 
     run: function() {
       if (this._tasks.length > 0 && this._rsHelper.isAbleToConnect()) {
-        this._rsHelper.connect().then(function() {
+        this._rsHelper.connect({address: 'a0:14:3d:29:d3:f0'}).then(function() {
           // on resolve
           this._intervalId =
             window.setInterval(this.onEachTask.bind(this), this._timeout);