Blind Spot Detection Systems are a series of sensors that can detect where you cannot see. The technology effectively tracks vehicles as they approach you from the side or behind. The Mando Blind Spot Detection (BSD) System uses a series of radars or ultrasonic sensors to provide you with 180 degrees of protective coverage around your vehicle. These sensors are designed to constantly monitor the lanes that are close to you and detect other vehicles -- even smaller ones such as bicycles and motorcycles -- as they approach you or enter your blind spot.