Bicycle Lock Bluetooth Intelligent Phone APP Control Smart Alarm Anti Theft Chain Waterproof 110dB Alarm Bicycle Lock Outdoor Powerful anti-theft smart cable lock,has the functions of anti cutting,anti disassembling,removing alarm and vibration alarm.IP44 waterproof grade,can use both indoors and outdoors Alarm sound up to 110dB,effectively frighten the thefts,ABS plastic+copper+cable(chain),strong anti-theft high quality material,Easy control with APP,you can lock and unlock your bike or motorcycle with your phone This item is BT Chain ,it has anti cutting,anti disassembling,removing alarm and vibration alarm functions.You can lock and unlock your bike or motorcycle with your phone APP.So,don't hesitate,it will be a good choice . Power: 3 *AAA alkaline batteries(not included) Color: Red Material: ABS+metal Size: about 92*55*34mm Package Contents: 1*Bluetooth Chain 1*User Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.