ITEM NAME:12V DYP-2HD01 Vibration Sensor for Security Detecting, Car Anti-Theft Syste C4Y1 12V DYP-2HD01 Vibration Sensor for Security Detecting, Car Anti-Theft Syste C4Y1 Vibrating sensing system consists of buzzer and contact spring Features fast response, high sensitivity and excellent performance Input Voltage: 12V Output: 0V, low level Working Current: 6-12mA this vibration sensor utilize buzzer and contact spring its vibrating system Size (L x W x T):Approx 1.9 x 1.5 x 0.8 inch Cable Length: Approx 38.5 inch Package Included:1x Vibration Sensor Note:Light shooting 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..Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.