diff --git a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSwpSBF77.java b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSwpSBF77.java
index b0364f46..c4d71399 100644
--- a/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSwpSBF77.java
+++ b/android_app/app/src/main/java/com/health/openscale/core/bluetooth/BluetoothSwpSBF77.java
@@ -20,6 +20,7 @@
 package com.health.openscale.core.bluetooth;
 
 import android.content.Context;
+import com.health.openscale.core.utils.Converters;
 import com.welie.blessed.BluetoothBytesParser;
 
 import java.util.Arrays;
@@ -34,6 +35,7 @@ class BluetoothGattUuidSBF77 extends BluetoothGattUuid {
     public static final UUID SERVICE_CUSTOM_SBF77 = fromShortCode(0xffff);
     public static final UUID CHARACTERISTIC_SBF77_USER_LIST = fromShortCode(0x0001);
     public static final UUID CHARACTERISTIC_SBF77_INITIALS = fromShortCode(0x0002);
+    public static final UUID CHARACTERISTIC_SBF77_ACTIVITY_LEVEL = fromShortCode(0x0004);
 }
 
 public class BluetoothSwpSBF77 extends BluetoothStandardWeightProfile {
@@ -58,6 +60,16 @@ public class BluetoothSwpSBF77 extends BluetoothStandardWeightProfile {
                 Arrays.copyOfRange(parser.getValue(), 0, 3));
     }
 
+    @Override
+    protected void writeActivityLevel() {
+        Converters.ActivityLevel al = selectedUser.getActivityLevel();
+        BluetoothBytesParser parser = new BluetoothBytesParser(new byte[]{0});
+        parser.setIntValue(al.toInt() + 1, FORMAT_UINT8, 0);
+        Timber.d(String.format("setCurrentUserData Activity level: %d", al.toInt() + 1));
+        writeBytes(BluetoothGattUuidSBF77.SERVICE_CUSTOM_SBF77,
+                BluetoothGattUuidSBF77.CHARACTERISTIC_SBF77_ACTIVITY_LEVEL, parser.getValue());
+    }
+
     @Override
     protected void setNotifyVendorSpecificUserList() {
         if (setNotificationOn(BluetoothGattUuidSBF77.SERVICE_CUSTOM_SBF77,