LED Dot Matrix Clock Car Thermometer Battery Voltage Measurement 1. Working voltage: DC 4.0-25V 2. Chip: Epson RX8025T 3. Power supply: contains a CR1220 button battery 4. Voltage display range: 4.0-25V 5. Temperature display range: -35 - 120 degrees Celsius 6. Power: 0.2W 7. Dimensions: about 9.3x3.6x1cm Features: 1. Multifunctional ultra-thin electronic clock module with a thickness of about 10mm, integrating time, temperature and voltage 2. One of the items can be displayed alone, or it can be displayed alternately in a loop, and supports customizing the content to be displayed 3. Using Epson RX8025T chip, with temperature compensation, accurate time 4. With brightness adjustment function, 5 levels of brightness can be adjusted 5. With automatic brightness function, it can be darkened at night and brightened during the day 6. Internal circuit board LED dot matrix 7. With a memory battery, when the external power supply is stopped, the time will continue to run