Audible distance indication: 1) 1.50 to 0.80m: Bi, Bi, Bi 2) 0.80 to 0.40m: Bi, Bi, BiBi (the closer, the faster) 3) 0.40 to 0m: Bi... (solid beeping) Visual distance indication:7 LED lights in 3 colors, another 2 LED lights indicating orientation of obstacles General specifications:1) Working voltage: 10 - 15V 2) Working temperature: -30 ~ 70癈3) Current consumption: 85dB at 10cm 5) Response time: 300ms 6) Ultrasonic frequency: 40kHz producing area:China payment:T/T, L/C supplying capacity:50,000 sets/month