diff --git a/android-sources/AndroidManifest.xml b/android-sources/AndroidManifest.xml
index db20d7f..d8e5b8a 100644
--- a/android-sources/AndroidManifest.xml
+++ b/android-sources/AndroidManifest.xml
@@ -15,7 +15,7 @@
     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.
 -->
-<manifest package="com.itsblue.speedclimbing_stopwatch" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="1.1" android:versionCode="12" android:installLocation="auto">
+<manifest package="com.itsblue.speedclimbing_stopwatchtest" xmlns:android="http://schemas.android.com/apk/res/android" android:versionName="1.1" android:versionCode="12" android:installLocation="auto">
     <application android:hardwareAccelerated="true" android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="speedclimbing stw" android:icon="@drawable/icon">
         <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation" android:name="com.itsblue.speedclimbing_stopwatch.MainActivity" android:label="speedclimbing stw" android:screenOrientation="unspecified" android:launchMode="singleTop">
             <intent-filter>
diff --git a/headers/climbingrace.h b/headers/climbingrace.h
index dbc1126..ada6797 100644
--- a/headers/climbingrace.h
+++ b/headers/climbingrace.h
@@ -86,6 +86,7 @@ public slots:
 
     // base station sync
     void handleBaseStationUpdate(QVariant data);
+    Q_INVOKABLE bool pairConnectedUsbExtensions();
 
     // functions for qml
     Q_INVOKABLE int getState();
diff --git a/resources/qml/SettingsDialog/SettingsBaseStationPage.qml b/resources/qml/SettingsDialog/SettingsBaseStationPage.qml
index eeac4c8..f29d474 100644
--- a/resources/qml/SettingsDialog/SettingsBaseStationPage.qml
+++ b/resources/qml/SettingsDialog/SettingsBaseStationPage.qml
@@ -1,7 +1,7 @@
 import QtQuick 2.9
 import QtMultimedia 5.8
 import QtQuick.Window 2.2
-import QtQuick.Controls 2.2
+import QtQuick.Controls 2.12
 import QtQuick.Layouts 1.3
 import QtGraphicalEffects 1.0
 import QtQuick.Controls.Styles 1.4
@@ -173,7 +173,7 @@ Column {
         id: baseStationConnectedOptionsComp
 
         ScrollView{
-
+            id: flickable
             contentHeight: baseStationConnectedOptions.childrenRect.height
             contentWidth: -1
             width: parentComp.width
@@ -185,7 +185,14 @@ Column {
             scale: 0.95
 
             ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
-            ScrollBar.vertical.policy: ScrollBar.AlwaysOff
+            ScrollBar.vertical: ScrollBar {
+                parent: flickable.parent
+                anchors.top: flickable.top
+                anchors.left: flickable.right
+                anchors.bottom: flickable.bottom
+                policy: ScrollBar.AlwaysOn
+                interactive: false
+            }
 
             Column {
                 id: baseStationConnectedOptions
@@ -229,6 +236,21 @@ Column {
                     }
                 }
 
+                SmoothItemDelegate {
+                    id: connectUsbExtensionsDel
+
+                    width: parent.width
+                    height: parentObj.delegateHeight
+
+                    text: "pair extensions"
+
+                    onClicked: {
+                        busyDl.open()
+                        var ret = speedBackend.pairConnectedUsbExtensions()
+                        busyDl.displayMessageAndClose(ret ? "OK":"error", ret ? "#6bd43b":"#e03b2f" )
+                    }
+                }
+
                 SmoothItemDelegate {
                     id: baseStationUpdateDel
 
diff --git a/sources/baseconn.cpp b/sources/baseconn.cpp
index 06b7cf2..bda8539 100644
--- a/sources/baseconn.cpp
+++ b/sources/baseconn.cpp
@@ -72,6 +72,7 @@ bool BaseConn::init() {
 
 void BaseConn::deInit() {
     this->connections.clear();
+    emit this->connectionsChanged();
     this->setState("disconnected");
 }
 
@@ -326,14 +327,15 @@ void BaseConn::socketReplyRecieved(QString reply) {
 // -------------------------
 
 bool BaseConn::updateTime() {
-    if(abs(this->timeOffset) < 10000000) {
+    if(abs(this->timeOffset) < 10000) {
         // the time is already up-to-date
         return true;
     }
 
-    // NOT IMPLEMENTED YET
-    return false;
+    QVariantMap ret = this->sendCommand(5001, this->date->currentSecsSinceEpoch());
+    qDebug() << ret;
 
+    return ret["status"].toInt() == 200;
 }
 
 bool BaseConn::updateFirmware() {
diff --git a/sources/climbingrace.cpp b/sources/climbingrace.cpp
index f8b0290..f8773b3 100644
--- a/sources/climbingrace.cpp
+++ b/sources/climbingrace.cpp
@@ -470,6 +470,12 @@ void ClimbingRace::refreshTimerText() {
     this->timerTextRefreshTimer->start();
 }
 
+bool ClimbingRace::pairConnectedUsbExtensions() {
+    QVariantMap ret = this->baseConn->sendCommand(5002, "", 10000);
+    qDebug() << ret;
+    return ret["status"] == 200;
+}
+
 // - athlete management -
 
 QVariant ClimbingRace::getAthletes() {