It is connected between the alarm and your vehicle's automatic window mechanism. When the alarm is activated when you leave the vehicle, the window left open automatically receives a signal from the alarm and closes it. When your window is on the upper window seal or the child is on the window, the circuit is automatically cut off with a slight pressure. Applicable for 2 front or rear automatic windows. Technical Information:Operating Voltage: 12V Package Content: Automatic Glass Lifting Module 2 pcs.