· Stage-by-stage sound alarm
· Smart VFD display inside the mirror
· Sensor style and color optional.
· 2/4/6/8 sensors system optional
· Human voice alarm optional
· Anti-freezing, rainy-proof design, work well under extreme cold weather         

·Working voltage: DC12V +/- 2V      
·Beeper: 70-90dB
·Working temperature: -40~+80°C
·Frequency: 40KHz
·Detection distance: 0.4-2m
·Alarm distance: 0.3-0.6m
·Best detection distance: 0.4-1.5m