Bluetooth bike lock alarm, easy to connect between the lock alarm and the phone over Bluetooth. Instantly lock or unlock your bike without key, you get the convenience of not having to carry a key and won't have to worry about losing your key Bike lock with alarm triggered by vibration, deterring thieves effectively by 110dB loud alarm. NOTE: Alarm goes off ONLY when disconnected to the app (your phone far away from the lock or disconnected your Bluetooth). Avoid noise to you in a safe range.Suitable for Bikes, Motorcycles, Vehicle, Doors, Windows, Gate, or anything you wish to protect Smart alarm lock with auto-unlock function that unlock automatically when connected to the app, therefore the lock will auto unlock when you approach. You can set the function on or off as you need The alarm will triggered if someone try to cut the cable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.