SPECIFICATION:: ?Control by wise computer from microchip USA ?Low power expend design ?Auto run when car begin to reverse,3 kinds of alarm voice.Buzzer Outside and alarm volume>78DB ?Errors prevent technology ?2 PC Wide sign detector ?Detecting range from 0.1?1.5M ?The detector endure temperature: -40～80°C ?Products prevent shock and wet. ?3M original glue. ?Detector color can choose from black,white, red,purple,blue,yellow,green,silver etc ?Outside carton:0.47x0.33 x 0.41m/10pc 9.0KG Inner box: 0.32 x 0.225 x 0.075m/pc 0.785KG