Long setting countdown time: 999 days, 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). Alarms for sixty seconds when the set time is reached. Includes clock function with 12-hour and 24-hour format options. Easy to set. Two placement options: magnetic back and adjustable stand. Suitable for various occasions such as vacations, weddings, baby arrivals, retirement, meetings, and study sessions. To set the clock: Press and hold the CLOCK button until the hour starts flashing. Use the UP/START or DOWN button to adjust the hour. Press CLOCK again to cycle through minutes and seconds. Press CLOCK once more to confirm. In clock mode, press the DOWN button to switch between 12-hour and 24-hour formats. To set the countdown: Press and hold the SET button until a number starts flashing. Continue pressing SET to navigate to the desired time unit. Use the UP/START or DOWN button to adjust the value. Keep pressing SET until the display stops flashing. Press UP/START to begin or pause the countdown. Press and hold both UP/START and DOWN buttons simultaneously to reset the timer. Powered by 2 x CR2032 batteries (included). Color: black. Material: ABS. Size: approximately 15.5 x 5.7 x 1.1 cm. Package includes: 1 x Digital timer clock. No other items included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.