... at front, 4 at rear 3. High quality and easy to install Speech parking sensor :Product features: - "BiBi" audible warning buzzer ... other language is available - For front detect, it will posepone to work 10 seconds after braking - 6 sensors, 4 for ... - Heavy rain-proof & All weather design - High quality and easy to install - Any display, any control unit connectable- Self-diagnosis, learning function ...