FUNCTIONS: ?Digital LCD dispaly ?Three-color background ?Three-step alarm sound ?Selftest function of sensors ?Unique design of display unit ?Volume switch available TECHNICAL SPECIFICATIONS: ?Rated voltage:12V DC(24V available) ?Operating Range:10.5~ 16V DC ?Rated Current:20~ 200mA ?Detecting Distance:0.2~ 1.5m ?Uitrasonic Frequency:40KHz ?Controller Working Temperature:-30~ +80℃ ?Display Working Temperature:-20~ +70℃ ?Display size:112*34*32mm