Functions: 1. The electronic clock is waterproof and dustproof, very durable to use. 2. One-button operation, which is practical and easy to use. 3. By default, you can display the hour, minute, second, date and timer, or disable the timer function according to your needs. 4. It adopts 24-hour display mode and has power-off memory function. 5. It adopts DC4.5-30V power supply voltage with reverse connection protection. Specification: Material : ABS Optional Color: Red, Blue, Green Supply voltage: 4.5-30 V (wide range) Backup battery: CR1220 (backup power for the clock, the time can be kept for more than 12 months without power) Working current: 120 mm Size: Approx. 54 x 30 x 27mm / 2.13 x 1.18 x 1.06 in Mounting Hole: Approx. 47.2 x 27.3mm / 1.86 x 1.07 inches Minimum supply voltage: 4.5V. Maximum supply voltage: 30V. Working temperature: -10 - 65 Working humidity: 10-80% (non-condensing) Working pressure: 80 - 106kPa Sunlight: No direct sunlight Package List: 1 x Electronic Clock Instructions: 1. Enabling: When the red positive and black negative connectors are connected to the power supply, the time will be displayed. Built-in CR1220-3V button battery backup turns, when the external power is not connected to the power supply, the clock will go to the end and will not stop. 2. Key switching sequence: time division - second mode - date mode - timer mode 3. Second mode: In time mode, press the button to display the second, display format: XX After about 30 seconds without pressing a button, it will automatically switch to hour and minute mode. Press again to go to the next mode 4. Date Mode: In time mode, press the button twice to display the date, display the date format: month. After about 30 seconds, it will automatically return to hour and minute mode. Press again to go to the next mode 5. Timer Mode: In the time display mode, press the button three times to enter the timing mode, display format: 00: .00 If there is no start time countdown, no button within 30 seconds will automatically return to hour and minute mode. In timing mode, press and hold the button to start timing. The dot below the colon starts flashing; then press and hold the button to pause time. The dot below the colon is always on and not blinking; Time clearing method: outer red, black line off, long press the button for about 5 seconds In timing mode, press the button to switch to hour and minute mode, and display date and seconds. 6. Time setting: In hour, minute or second mode, press and hold the button until the number of hours flashes, indicating the time is set, then press the button again to set the hour. After setting the hour, press and hold the button until the number of minutes flashes, indicating that the minute setting has been entered. Press the button again to set the minutes. After the minutes are set, long press the button until the second number flashes, indicating the second setting is entered, press the second to clear, long press to exit the time setting mode and save the set time. If no button is pressed for about 30 seconds during the time setting process, it will exit the setting mode automatically. 7. Date setting: In date mode, long press the button until the year number flashes, the watch enters the setting mode, and press the button once to set the year. Press and hold the button until the month number flashes, indicating that the month is set. Press the button again to set the month. After setting the month, press and hold the button until the day number flashes, indicating that the day is set. Press the button again to set the day. After setting OK, press and hold the button to exit date setting mode and save. If no button is pressed for about 30 seconds during the date setting process, it will exit the setting mode automatically. Please be aware of: