Product Introduction Thank you for your choosing our Blind Sport Monitoring System (BSM). This system is avehicle aistance device that helps driver lane changing safely during driving. With the aid of24GHz microwave sensor, probe the side / rear of the vehicle for those moving objects into theblind spot of the detection zone. The system works in two microwave sensors, two LED light(or blind region monitor), a buzzer and the wire harne which is the perfect connection ofmicrowave and computer.There is blind zone at the rear of the vehicle which is easy to endanger driving safety.! Whenyou installed BSM into your lovely car, no matter it's day time, night time or even in the snow.you can be alerted whenever there is a moving object pop into the rear of the vehicle, with theaid of LED lighting on , blinking, buzzer sound so that the driver can be cautious when lanechanging to avoid the poibility of side crash accident.This system is easy to be installed.no need to punch, non destructive car appearance. lnstalled at the plastic bumper left / rightside of the rear of the vehicle, will instantly improve the use of the original car performanceLane changing has warning,make driving saferSincerely thanks for the choice of this svstem.