Product specification Size: 92X55X34mm Material: ABS plastic + copper Power supply: 3 "AAA" batteries (ie 7th battery) Cable specification: length 80cm/M diameter 10mm Working temperature: -10°C~+60°C Storage temperature: -20°C~+80°C Product weight: 230g Three AAA alkaline batteries When the power is less than 20%, the red light of the lock flashes quickly, and the mobile phone app will also display a low battery prompt. When the power is less than 10%, the lock will not be locked. Please replace the battery in time. Lock: Install the battery, tighten the battery cover screw, insert the lock, press the upper button to hear Dididi three times automatically lock (if the above steps are not done, you will not be able to lock) Unlock: Choose to automatically unlock, without operating the phone. When the phone is close, the blue light on the lock flashes to unlock, and when the phone is away, it is locked. It prompts that you can quickly unlock and lock the phone by turning the Bluetooth on and off Bluetooth bike lock alarm, easy to connect between the lock alarm and the phone over Bluetooth. Instantly lock/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 Alarm cable lock made of braided steel and PVC coating, Cable IP55 waterproof anti theft alarm lock, don’t worry about the alarm on rainy days. We provide one year limited warranty. If you have any question, just email us for free customer service