Feature:
*Sensor: Double frequency (original import) and low voice instruction
*when some unauthorized person intrudes, it will be triggered; However when hosts are move in room or they go out of the detecting area, it will not be triggered
*Can be installed upon window, balcony, upper side of doors etc

Technical specifications:
Detecting angle: Vertical 100° Horizontal 10°
Transmission frequency: 315MHz± 0.5 MHz
Sending distance: No obstacle 80m