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 sixty seconds when the set time is reached. Features a built-in clock function with 12/24-hour format toggle. Easy to operate with intuitive controls. Can be placed in two ways: includes magnetic back and adjustable stand. Suitable for various occasions such as vacations, weddings, retirement, meetings, studying, and more. 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 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 timer: Press and hold the SET button until a digit begins to flash. Press SET repeatedly to select the time unit to adjust. Use UP/START or DOWN to change the value. Hold UP/START or DOWN for faster adjustment. Continue pressing SET until the display stops flashing. Press UP/START to begin or pause the countdown. To reset, press and hold both UP/START and DOWN buttons simultaneously. Powered by 2 x CR2032 batteries (included). Available in black and white. Made of ABS material. Unit 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 product image and the actual item. Measurement may vary by +/- 1-3 cm.