12V 1.7" Blue LED Car Digital Thermometer Voltmeter Clock Module

Description:   
Length: 40.2mm, width = 12.8mm, thick ≈14mm
Display color: Blue
Display mode:         
1. display time only     
2. display temperature  only     
3. display only voltage     
4. time temperature voltage alternating display (Note: under alternate display mode, through dd option to choose whether to display the temperature or voltage, dd:0 displays time + temperature + voltage. dd:1 displays time + voltage. dd:2 displays time + temperature)

Features:
1. Set the time, temperature, voltage, three functions in one
2. manual error correction function with a temperature setting range -5℃ ~ 5℃
3. With backup battery, power-down time to continue to go

Electrical Characteristics:
1. Input voltage 7 ~ 30V. Note that when using as a voltmeter, the input voltage is at least more than 7V.
2. Voltmeter range 7 ~ 30V, error ± 0.1V, the measured voltage is the input voltage.
3. Temperature measurement ranges from -50 to 130℃
4. Working current is about 30MA.