Description Three colors led parking tips and parking sound tips, different lights corresponding to different sound single prompt. 2.4 meters from the green light tips, 0.5-1.4 meters from the yellow light tips, 0.45 meters from the red light and alarm tips. Ultrasonic frequency: 38.5 ~ 50kHz; Boot self-test function, low power display. Power: 9V battery (not included) or 9V battery charge Material:ABS Size:186*60*39mm Is one of the best parking helpers you could have, after the simple installation, every time you drive into your car parking position, the sensors will show up... .