Product Name: Wireless Parking Sensor SystemModel Number: B-2681Place of Origin: ChinaFeatures: 1) The system is activated automatically when reverse gear is engaged. It\'\'s wireless digital display with built-in buzzer and chirp warning 2) Available sensors quantity: 4 rear sensors 3) Audible distance indication 4) Distance and sound a) 1.50 - 0.80m: Bi, Bi, Bi b) 0.80 - 0.40m: Bi Bi BiBi (the closer, the faster) c) 0.40 - 0m: Bi... (solid beeping)