Suitable for large digital countdown timer clock - 999-day countdown for graduation (black) Countdown time for long settings: 999 days, 23 hours, 59 minutes, and 59 seconds. Improved version: larger size. LCD screen size: 13.8 cm x 4 cm / 5.4 x 1.6 inches. It will sound an alarm for sixty seconds when it reaches your target number. With clock function. You can switch between 12- and 24-hour systems. Easy to set. There are two ways to place it: with a magnetic back and a movable stand. Wide application: engagements, weddings, newborns, retirement, meetings, studies, and so on. How to set the clock: Press and hold the CLOCK button until the "hour" number starts flashing. Press UP/START or DOWN to set this specific number. Press and hold the CLOCK button to set minutes and seconds. Press the CLOCK button again to start. In CLOCK mode, press the DOWN button to switch between 12- and 24-hour systems. To set the countdown time: Press and hold the SET button until a number starts flashing. Press the SET button to reach the number you want to change. Press UP/START or DOWN to set that specific number. The number will change rapidly. Keep the SET button pressed until the screen stops flashing. Press the UP/START button to start or pause the countdown. Press and hold the UP/START and DOWN buttons simultaneously to reset to 0. Requires: 2 x CR2032 batteries (included). Color: Black. Material: ABS. Size: Approx. 15.5 x 5.7 x 1.1 cm. Package Contents: 1 * Digital Timer. Only the above package contents are included; other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.