Bike Chain Lock Bicycle Bike Anti-theft Smart Bluetooth Alarm Lock Keyless Phone APP Control iOS and Android System Support Automatic and Manual Modes (Black) [Condition] The product has been opened for inspection, but it is unused. Stored at home. Instruction manual included, but in English. [Color] Black ...Quoted from the site product page... [Product Description] The bike lock is made of ABS plastic and high-density copper, making it sturdy and durable. Three AAA batteries can last for about 8 months if used twice a day. The bike chain lock is perfect for bikes, motorcycles, gates, etc. App control works on both iOS and Android systems and offers automatic & manual unlocking. The former means that simply placing your smartphone near the lock will cause the blue light to flash and the lock to unlock automatically. The smart lock's anti-theft design triggers a 105dB alarm if someone tries to damage the lock. When the alarm sounds, place your phone near the Bluetooth and application control area to stop the alarm. Remember the code. The alarm lock allows you to check the power on your phone. A red LED flashes, indicating that timely charging is required. When the power level is less than 20%, the red light flashes to prompt charging in time, and the lock will not function below 10%. [Notes] Please note: Insert the batteries, screw on the battery cover, plug in the cable, and press the bottom of the lock. The lock will be locked when you hear three beeps; download the APP, press the lock button, turn on Bluetooth, search for the device, enter the password, and set the required functions. [Shipping Method] Weekdays 39-19