1:Wireless window/door alarm with music 2;Can be used to door,window, shop or supermarkets and so on 3:Use 3 "AAA" batteries wireless door magnetic and window sensor; entry alarm; magnetic door sensor, window sensor Wireless transmitter, it sends wireless signal to the control panel when it is triggered. Installing place: door, window, draw, cabinet...and so on. How to use :Put this surveilance ...