Installation Method Connect the clock to the power supply by matching the poles: red is positive and black is negative. This is the standard polarity. If you cannot connect correctly or the link is wrong, please contact us for assistance. Readability and Size Large LED digits provide time at a glance for easy reading. The display is easy to read while the unit remains small, portable, and convenient to use. Four Display Modes Mode 1: Display time only. Mode 2: Display temperature only. Mode 3: Display voltage only. Mode 4: Time, temperature, and voltage alternate display. In the alternate display mode, the dd option selects what is shown: dd 0: time, temperature, and voltage dd 1: time and voltage dd 2: time and temperature Thermometer Function The mini LED clock shows hours and minutes. It helps you know the time without glancing at a watch or phone, supporting safer driving. Temperature measurement range: 50 to 130 degrees Celsius. Temperature error can be corrected manually within a setting range of 5 to 5 degrees Celsius. Practical Applications In a vehicle, use as a dashboard clock to monitor time, temperature, and battery voltage without distraction. On a desk or bedside, use as a compact clock with temperature readout for quick reference. In a workshop or with a power supply, use to monitor time along with temperature and voltage during experiments or setup.