... sensor: 1. "BiBi" audible warning 2. 6 sensors, 2 at front, 4 at rear 3. High quality and easy to install Speech ... detect, it will posepone to work 10 seconds after braking - 6 sensors, 4 for rear detect, 2 for front - Heavy ... rain-proof & All weather design - High quality and easy to install - Any display, any control unit ... Front and back Buzzer speech parking sensor(BB-02-6)