Description: This smart lock can keep your bike safe with easy operation, you don't have to worry about losing your bike key, just unlock it with a phone. Made of ABS plastic, it is durable and waterproof, and the cable is made of copper, durable and sturdy for safety. This lock works well for iOS and Android systems, suitable for most smart phones. The anti-theft design is fabulous, any attempt to damage the appearance would trigger a 105dB alarm, loud enough to make the bad guy give up. You can check the remaining power on your phones and even if you forget, the LED light will flash to remind you to charge timely. This is perfect for everyday use for bicycle, motorcycle, gates, etc. Add it to your chart and live a safe life from now on. Features: 1. Made of high density ABS plastic and copper, sturdy and durable. 2. App control works for both iOS and Android systems and offers automatic manual unlocking. 3. Anti-theft design, any attempt to damage the lock triggers a 105 dB alarm. 4. The power can be checked on mobile phones, and the LED red light flashes to remind charging timely. 5. Perfect for bike, motorcycle, doors and etc. Specifications: Material: ABS plastic copper Color options: Red; Black; Blue Cable Length: 80cm / 31.49in Cable Diameter: 1cm / 0.39in Weight: Approx. 311g Power Supply: 3 * AAA Batteries Package Included: 1 * Lock Only Rated: 1. Three AAA batteries, assuming two uses per day, can last approximately 8 months. 2. When the power exceeds 20%, the red light flashes to remind you that charging is fast; beyond 10%, the lock cannot operate. 3. Insert the batteries, screw the battery cover, plug in the cable and press the bottom of the lock, the lock is locked after emitting 3 beeps. 4. Download the app, press the lock button, turn on your Bluetooth and search for the device, enter your password and start setting the necessary functions. 5. Two unlock modes, automatic and manual. The first means that you just need to place the smartphone near the lock, when the blue light flashes and the lock unlocks automatically; When the phone is far from the lock, the lock will automatically lock. The latter means you have to enable Bluetooth and the app for unlocking every time. 6. After the alarm is triggered, the cell phone must be near the control area with Bluetooth and APP enabled to end the alarm. 7. Please remember your code, after the cell phone is changed, the lock and the new cell phone need matching, if you forget the code, the lock can no longer be used.