Long countdown setting time: up to 999 days, 23 hours, 59 minutes, and 59 seconds. Upgraded design with larger size. LCD screen measures 13.8 cm x 4 cm (5.4 x 1.6 inches). Sounds an alarm for 60 seconds when the set time is reached. Features a built-in clock function with 12/24-hour format switchable. Easy to operate. Can be placed in two ways: includes magnetic back and adjustable stand. Suitable for various occasions such as vacations, weddings, newborns, retirements, meetings, and studying. 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 value. Press CLOCK repeatedly to set minutes and seconds. Press CLOCK again to confirm. In clock mode, press the DOWN button to toggle between 12-hour and 24-hour formats. To set the countdown timer: Press and hold the SET button until a number flashes. Continue pressing SET to navigate to the digit you wish to adjust. Use UP/START or DOWN to change the value. Press SET repeatedly until the display stops flashing. Press UP/START to begin or pause the countdown. To reset to zero, press and hold both UP/START and DOWN buttons simultaneously. Powered by 2 x CR2032 batteries (included). Color: Black. Material: ABS. Dimensions: 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 settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.