ROBUST: ABS plastic+Copper+Braided Steel combined with robust design for a long time use. Braided Chain is 6 mm in diameter and 31.5Inch in length works for most security needs. ALARM: Clipping or Vibrating triggers alarm at 110db to deter thieves or burglary on the spot (vibration alarm NOT work when the owner's phone is connected to the device.) WATERPROOF Grade: IP55 (Splash ) and Operates in temperatures between -14 to 140 Fahrenheit. App Control: Bluetooth operation for both IOS and android phones, press lock button on the device to lock and unlock with your fingertip on your phone app. Power: 3 x "AAA" batteries are required which lasts for 5 months use (Opened twice, daily). Low battery indicator in the solebe App warn you when power is less than 20%., Weight: 1.51788267387 Pounds, Manufacturer: Jaywool