Features:
Automatically activated when reversing gear is engaged;
The closer the obstacle is, the faster the alert beeping frequency is to indicate the safety zone, caution zone and danger zone;
2/4/6/8 ultrasonic sensors selectable; 
Voice report optional;
3-Color background screen;
Ajustable volume: HI/LO/OFF;
Dynamic digital LCD display to indicate differentdistances as well as orientation of the obstacle (front or back);
Dynamic sketch indicater of the working sensors;
Exact distance display STOP reminder. 

Technical Parameters:
Operating voltage: 12V DC (24V optional)  
Operation current: 20mAh ~ 200mAh
Sensor installation height: 45 ~ 60cm
Detection distance: 0.3 ~ 2.0m
Ultrasonic frequency: 40kHz
Operating temperature: -40°C ~ +85°C
Beep volume: 80 ~ 100dB (at 30cm distance)