100% brand new and high quality Can be used to stick it on the door or window， when senses vibration of door or window， the alarm will make a 120dB alert voice for about 30sec， convenient and useful， good home security alarm Please get the battery out if long time no use Item Type: Home Security Alarm Device Material: Plastic Sensor Type: Vibrating Sensor Working Voltage/Current: 9V/100mA Alert Voice Volume: 120dB Power: 1* Gf22 Battery(Not Included) Color: Black Size: 10*6.5*3cm/3.9*2.6*1.2in(L*W*H) Package Included: 1* Home Security Alarm Device