0.56" Digital Clock Electronic LED Voltage Meter 12V 24V 36v 48v Car 28TC Highlight: This device has two temperature sensors, for car interior and car exterior, the sensors are 150cm and 300cm. Features:1. Set time, temperature, voltage, three functions in one2. Manual error correction function with temperature setting range-5 degrees Celsius - 5 degrees Celsius Electrical characteristics:1. Input voltage 5 - 60V2. Voltmeter range 5 - 60V, the measured voltage is the input voltage.3. Temperature measurement range from -40 °C to 120 °C4. The working current is about 30MA5. Size: hole size 26*58mm thickness 23MMComach size: 60MMX28MM Usage:The keyboard plate has two keys: S (setting), M (mode);1. Under normal use, press "S", "minute" flashes, and then press "M", "minute" increases from 00 to 59 cycles. After setting the "minute", press "S", the "hour" flashes, and then press "M", the "hour" goes up from 00 to 23 cycles. After setting the "hour", press "S", the "date" flashes, and then press "M", the "date" increases from 1 to 31 cycles2. Then press "S", AC:xx and Ac:xx are displayed, (AC means temperature sensor 1, Ac means temperature sensor 2. xx is the value to correct the temperature value in degrees. Press "M" to adjust the temperature error correction value, from -5 - 5, the positive number increases, the negative number is decreased. After correcting the temperature error, then press "S" to save all data and return to normal display.)3. Then press "S", dd:0 means time + temperature 1 + temperature 2 + voltage,Dd:1 means time + temperature 1 + temperature 2,Dd:2 means time + temperature 1 + voltage,Dd:3 means time + voltage4. Then press "S", DF stands for Cyclic Display Time. Note1 . Please allow 1-2mm error due to manual measurement. Make sure you don't mind before you bid.2. The colors may have different depending on the difference displayed, please understand. Package Included1 x Digital Car Clock LED Temperature Voltage 5 - 60V Car DIY Electronic Clock Module