Product alarm sound:1: English voice2: Buzzer alarm3: MuteSwitching by keys on the display IMPORTANT NOTICE: We provide various sensors colors for your choice, in your purchase, please tell us the color to the sensors, If you need some special colours for the sensors, please send us the NAME OF YOUR CHOSEN COLOURS while confirming order, then white sensors, and paint them to the matching finish of your car. Characteristics of solar wirele reversing radar 1: It is an upgraded version, it is common for trucks and cars, working voltage is 12V~24V2:wirele connection, lole installation,3:Four alarm sound modes can be switched, and the third volume can be adjusted.4: Prevent expensive collisions5:Rate current: 100mA - 300mA6:Ultrasonic frequency: 40KHz7:Control moudle working temperature: -30 - 80 celcius degree8:Display working temperature: -20 - 70 celcius degree9:Sensor diameter: 22mm10:Installation mode: Drilling Solar automatic charging Display built-in battery, solar charging, 365 days without worry all year round Wirele long-distance receiving signal Easy to install, the control unit and the display get rid of the cable line