Main Features:

1. Stage-by-stage sound alarm
2. Digital colors VFD display, 2-digital with 3 colors in mirror background  indicate distance
3. Sensor style optional
4. Sensor Color:black, white, silver, blue, red etc optional
5. 2/4/6/8 sensors system optional
6. Human voice alarm (option)
7. Anti-freezing, rainy-proof design, work well under extreme cold weather