APP CONTROL - Works for iOS and Android system, just lock and unlock your bike or motorcycle with your phone by bluetooth(for Android 4.3 and for 4s above systems). HIGH QUALITY MATERIAL - Made of ABS plastic and high dense copper, it's and waterproof, strong anti-theft high quality material. Anti cutting, anti disassembling,removing alarm, vibration alarm. LOW BATTERY REMINDER - 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%. 110DB ALARM FUNCTION - Designed with 110dB alarm function, effectively frighten the thefts can use both indoors and outdoors. SATISFICTION SERVICES - We solemnly promise you that if you find problems with the product itself, you can contact us in time. we will definitely give you a reply in the first place and return it for you. please feel to use it., Manufacturer: Sonew