Features: 1. Made of ABS plastic and high dense copper, sturdy and durable. 2. App control, works for both iOS and Android system and offers automatic & manual unlocking. 3. Anti-theft design, any try to damage the lock triggers 105dB alarm. 4. Power can be checked on cellphones and LED red light flashes for reminding of timely charging. 5. Perfect for bike, motorcycle, gates and etc. Specification: Material: ABS Plastic & Copper Color Options: Red; Black; Blue Cable Length: 80 cm / 31.49inch Cable Diameter: 1 cm / 0.39inch Weight: approx 311 g Power Supply: 3 * AAA Battery Package Included: 1 * Lock Only Noted: 1. Three AAA batteries, assuming two times of usage in each day, can lasts for about 8 month. 2. When the power is beyond 20%, the red light flashes to remind you of timely charging; beyond 10%, the the lock can't work. 3. Put batteries in, screw the battery cover, plug in the cable and push the lock bottom, the lock is locked after it beeps for 3 times. 4. Download the APP, push the lock button, turn your bluetooth on and search the device, enter your password, and start to set necessary functions. 5. Two unlocking modes, automatic and manual. The former means you just need put smartphone near to the lock, when blue light flashes, and the lock automatically unlocks; when the phone is far from the lock, the lock automatically locks. The later means you need to turn on bluetooth and app for unlocking every time. Anti-theft design, any try to damage the lock triggers 105dB alarm App control, works for both iOS and Android system and offers automatic & manual unlocking Made of ABS plastic and high dense copper, sturdy and durable Power can be checked on cellphones and LED red light flashes for reminding of timely charging Perfect for bike, motorcycle, gates and etc