1. 120DB ALARM SOUND: Wireless door alarm sound a high pitched alarm up to 120dB upon detecting a vibration, scaring away burglars or intruders. 2. STRONG ALARM: When someone illegally opens a door or window, the alarm can sound a strong alarm to warn the intruder away and alert the homeowner. 3. EASY TO INSTALL: Wireless vibration alarm is easy to install, just suspend it on a doorknob, behind a door, in a lock position, or on a window. 4. EASY TO CARRY: Security door alarm instantly detects any movement inside a door or window. and mini, easy to carry. 5. SCOPE OF APPLICATION: Window alarm sensor is suitable for home, apartment, mobile home, hotel room, garage, etc. to protect your safety. Alarm Volume: 120 DB Battery: 2 x CR2032 Battery (Included) Colour:Black Material:ABS Package Contents: 1x Vibration Alarm Sensors 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.