Specification: Battery: 2 1543 button batteries Material: ABS+Acrylic Colour: Black, Red Operation method: 1. Hold down the button and display the time 2. Press the m key to switch the time and date, and start a 60-second countdown 3. Press the s key to set the corresponding time, date, reset countdown, and s key Press the first one to switch the date, the second one to set the month, the third one to set the date, Set the hour for the fourth time, and finally return to the time interface. 4. Countdown: Press m to switch to the 60-second countdown interface, press s to reset the countdown Package Included: 1 x portable LED projection clock (with battery) Projection effect (for reference only)