DescriptionSize: 13.3cm*2.2cm L x W Material: Plastic+LEDCase color: blackDisplay color: blueVoltage: 12VTemperature range: -40~75Function: 3 in 1 Time/Temperature/VoltageDisplay mode:1. Time only2. Temperature only3. Voltage only4.Time Temperature voltage alternatingNote:1. With memory after the display mode is set once.2. Temperature deviation manual correction in the range of -5 ~ 5 .3. Built-in imported super long life memory battery which makes the clock keep working even after the car is power off.How to use:Turn on the power of the car, the time will be showed on the car mounted clock monitor The display will be off when the car power is turned off so the power of the clock is not consumed. The internal clock can work properly by it is industrial rechargeable battery Frequently replacement is not needed and the professional imported chip makes the time to be very accurate. 1pc clock, 1pc adhesive tape, 1pc English-language manual