App Control: Bluetooth operation for both IOS and android phones, lock button on the device to lock and unlock with your fingertip on your phone app. 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.) 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. WATERPROOF Grade: IP55 (Splash ) and Operates in temperatures between -14 to 140 Fahrenheit. 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%. Color:Black Material:Plastic + Stainless Steel Package Contents: 1 * Chain lock 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection 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.