Description: Size: 13. 2. 3 cm x 2 cm L W Material: LED plastic + housing colour: black. Display colour: blue/red/green. Voltage: 12 V. Temperature range: 40 ~ 75 ƒ Function: 3 in 1 time/temperature/voltage. Display mode: 1. Temperature only 3. Voltage only 4. Time alternating voltage temperature Note: the memory 1.After the display mode is set ounce.2.Temperature deviation manual correction in the range of 5~5ƒ.3.Built super long life memory battery that makes the clock continue to work even after the car is off.