The alarm can be turned on and off in the status bar on the homescreen when your phone is connected to the hub. Tap the lock sign to activate the alarm and tap again to turn it off. You should hear a sound feedback when touching the lock sign and the status LED light as well as the front light should blink for about 2 seconds. The alarm can only be activated and deactivated with installed eBike battery or COBI.Bike Battery pack for standard bikes.