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Description:Product features 1.3-color leds are used to show the distance to obstacles on both the left and right handside. The sr650 also use human voice to tell distance 2. High quality and stable sensors ensure the detection precision 3. Advanced microchip technologies enhance the whole system stablity 4. Clear and comfortable heartbeat tones release your eyes 5. The warning signs for safety, alert and stopping areas are clear and easy to distinguish Technical specifications for 3-color LED display series of parking sensors Power consumption maximum at 2.0w Working voltage DC 9--15v Working temperature -20--+70c Distance coverage 0.3--2.0m Display leds used to display distance and lighting bars to display the directions of obstacles Display resolution 0.1m Voice for sr650 1.5m,1.0m,0.6m, stop Sensing angles 60 degrees for both x and y directions Buzzer 65db Tone frequency 1.6-2.0m: (silence); 1.1-1.5m:1 hz (very slow); 0.6-1.0m:3 hz (slow); 0-0.5m:7hz (fast) We also have buzz sound, blue LCD display, color LCD display, unicolor and multicolor sensors for your choice Price is $15 or even lower!