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Description: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°C 3) Current consumption: <100ma 4) Acoustic volume:>85dB at 10cm 5) Response time: 300ms 6) Ultrasonic frequency: 40KHz