3-stage progressive alarm to prevent bumping

1.5 to 1.0 m: Long interval Bi Bi Bi, safe reversing

1.0 to 0.5 m: Short interval Bi Bi Bi, more harsher when closed, slow reversing

0.5 to 0.2 m: Continuous Bi...., stop reversing

Auto-detecting and auto-alarming mechanism

A beep indicated when turns to reverse gear

MICROCHIP CPU from USA.

Waterproof sensors

The sensors aid detecting potential back obstacles and enable accurate distance measurement

To make reversing safe and convenient

Detecting range: 1.5m- 0.2m

Operating temperature: -30centigrade~ + 85centigrade

Voltage: DC 12V, +/-2V (optional: 24V)

Frequency: 40kHz