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Picture 1: What you see above is what you get. ( click icon  to download manual in pdf format) 9v battery included, but not shown in photo above. This device uses ultrasonic waves to detect distance from car to the sensor.
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Offered here is 10 PIECES  BRAND NEW Car park video/audio indicator.
Green light lights up when the car is 5 meters from the sensor.
Yellow light lights up when the car is 1.5 meters from the sensor
Yellow light lights up and alarm sounds when the car is 0.5 meter or less from the sensor
Specification:
Ultrasonic frequency: 38.5 - 50khz
Auto calibration when power on
Low Battery indication
Power: 9V battery 9included)
Color: Dark Grey
Size: 186 * 60 * 39mm for the lights and 80 * 60 * 30.5mm for the ultrasonic sensor
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