Long setting countdown time: 999 hours, 23 hours, 59 minutes and 59 seconds. Upgraded version with larger size. LCD screen size: 13.8 cm x 4 cm / 5.4 x 1.6 in. Alarm sounds for sixty seconds when the set time is reached. Includes clock function with 12-hour and 24-hour format options. Easy to operate. Two placement options: magnetic back and adjustable stand. Suitable for various occasions such as vacations, weddings, newborns, retirement, meetings, studying, and more. How to set the clock: Press and hold the CLOCK button until the hour digits flash. Use the UP/START or DOWN button to adjust the hour. Press CLOCK again to cycle to minutes and seconds. Press CLOCK once more to confirm and start. In clock mode, press the DOWN button to switch between 12-hour and 24-hour formats. How to set the countdown timer: Press and hold the SET button until a number begins flashing. Press SET repeatedly to navigate to the digit you wish to change. Use the UP/START or DOWN button to adjust the selected digit. Press and hold for faster adjustment. Continue pressing SET until the display stops flashing. Press the UP/START button to begin or pause the countdown. To reset the timer to zero, press and hold both the UP/START and DOWN buttons simultaneously. Requires: 2 x CR2032 batteries (included) Color: black Material: ABS Size: approximately 15.5 x 5.7 x 1.1 cm Package Contents: 1 x Digital timer clock Note: Lighting and display differences may cause slight variations between the product color in images and the actual item. Measurement error allowance is +/- 1-3 cm.