Cable to connect to alarm ., Instructions Quality Products at fantastic prices!, Dimensions: ., Unit: 6., 7cm x 6., 0cm x 1., 5cm . Van Alarm System Wireless Ultrasonic Sensor Car Parking System | Ultrasound | Arduino Vehicle Interior Motion Detector Ultrasonic Sensors will monitor the inside of the vehicle. Car Ultrasonic Sensors | Parking & Vehicle detection Frequency: 40Khz Crystal Locked . Compatible with any alarm with a negative trigger input . Input voltage: 9v Min., , 15v Max., Package Contents: ., Main Unit . Sensor cable lengths: 240cm . Simply fit a sensor to each side of the windscreen using the spring clips supplied., ., Fully Adjustable Sensitivity ., Negative Trigger Output . Car Parking Low Frequency Ultrasonic Transducer Sensor Black Grey White Ultrasonic Sensors are alternative for microwave radar sensor. Protect your vehicle from theft with this ultrasonic dual sensor kit for use with your car alarm. The ultrasonic sensor kits works by monitoring the air pressure inside your vehicle but when a window or door is opened the pressure levels change and the alarm will be triggered trigger output current: 100mA .