Door security alarm that alerts intrusions with a 90dB volume. - Volume: 90dB - Function: Door/window security alarm - Country of Manufacture: China - Color: Black - How to use: Slide-type setting Thank you for viewing. For crime prevention in homes, offices, and stores! Security door/window alarm 　Open detection device 　　Doors/sliding windows Easy installation and no wiring required with the included double-sided tape Battery operated 　Alkaline AAA batteries x 2 (sold separately) Alarm activates when opened Set contents 　Alarm unit: 1 　Magnetic sensor: 1 Please note that the item has not been opened after purchase, so the operation has not been confirmed.