Item Length:9.2cm Material Type:ABS plastic + copper Item Type:Locks & Latches Item Weight:230g Item Width:5.5cm Model Name:Lock Item Height:3.4cm 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: -10C~+60C Storage temperature: -20C~+80C 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