1.parking sensor (BY-01D602) 2.parking sensor 3.buzzer parking sensor, 4.parking aid 5.CE ROHS certificate function: ·Stage-by-stage sound alarm ·Sensor style and color optional. ·2/4/6/8 sensors system 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 installation specification: