Anti Theft Alarm: Once triggered, 110 db loud alarm can be a great deterrent for thieves. It is suitable for doors, windows, bikes, motorcycles and anything you would like to protect. Wireless Alarm System: Comes with a remote control. Press the first key to activated alarm, press the second key to deactivate alarm. Remote control distance up to 25m. DIY Installation: Comes with double-sided sticker, just peel and stick to install alarm on anywhere. Battery: Main unit - two AAA alkaline batteries, remote control - one 27A alkaline battery. Sensitivities Adjustable: With 10 level sensitivities, high to low corresponds to touch, vibration and beat. You can set suitable level as actual need. Programmable & Expandable: One host can learn 8 remote controllers, and one remote controller can control multiple hosts.