1). Radar sensor activate when the reverse gear is engaged 2). Detected in back 3). Full-weather 4). Wireless technology 1). Radar sensor activate when the reverse gear is engaged 2). Detected in back; full angle LCD, warning sound can be turn on/off3). Full-weather design, un-affected by wind, ice, snow or rain4). Use the RF wireless technology5). Detecting range from 2.5-0.3m with precision ...