Features:Made of ABS plastic and high dense copper, it's durable and waterproof, strong anti-theft high quality material. Designed with 115dB alarm function, effectively frighten the thefts can use both indoors and outdoors.Anti cutting, anti disassembling,removing alarm, vibration alarm. Perfect for all bikes, motorcycles, door etc.Low consumption and long standby time. 3 "AAA" batteries are required which last for 8 months use (based on every day open twice). Low battery indicator in the app will warn you low battery when power is less than 20%. Works for iOS and Android system, just lock and unlock your bike or motorcycle with your phone (for Android 6.0 and for IOS7.0 above systems).Specifications:Material: ABS plastics + manganese steel + copper + stainless steelColor: RedAlarm Type: Acousto-optic AlarmAlarm sound: up to 115dBPower supply: 3 AAA batteries (tax free) (Not Included)Applicable Temperature: -10~60 Size: Approx.9.2 * 5.5 * 3.4 cm/3.6*2.2*1.3inPackage Weight: 792g/27.9ozPackage List:1 * Smart Bluetooth Bicycle Lock (Batteries Not Included)1 * User Manual1 * Screwdriver.