FUNCTIONS: ?Digital LED display ?Three-stage simulated alarm ?Front and back detection ?Four-stage simulated obstruction ?distance display 　 TECHNICAL SPECIFICATIONS: ?Rated Voltage: 12V DC(24V available) ?Operating Range: 10.5~16V DC ?Rated Current: 20~300mA ?Detecting Distance: front(0.4~0.7m) back(0.2~1.5m) ?Ultrasonic Frequency: 40KHz ?Working Temperature of Control Box: -30~+70℃ ?Working Temperature of display: -20~+70℃ ?Display Size: front(120*30*27.5mm) ?back(141.2*57.6*25.2mm)