Technical Parameters: Operating voltage: DC 9V (9V alkaline battery)(ship without the battery) Alarm sound pressure: 120dB Induction : vibrating alarm Start delay: 15 seconds Alarm delay: Installation: Magnetic back can also be hung Dimensions: 90 x 55 x 27mm Instructions: The right of the toggle switch alarm "ON" position, the red indicator fade, light off after 15 seconds. State of alert, when the alarm or minor shock when struck, will be issued 120dB alarm sound immediately. Alarm time is about . This product can be directly linked to the need for security position, the back of a magnetic disk, can also be directly attracted to the metal object. material: plastic Color as shown Package Contents: 1 x Vibration Detector 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.