Long countdown timer: up to 999 days, 23 hours, 59 minutes, and 59 seconds. Upgraded design with larger LCD screen: 13.8 cm x 4 cm (5.4 in x 1.6 in). Audible alarm sounds for 60 seconds when countdown completes. Built-in clock function with 12-hour and 24-hour time format selection. Simple and intuitive operation. Dual mounting options: integrated magnet back and adjustable stand. Versatile use: vacation, wedding, new year, retirement, meetings, study, and more. Clock setup: - Press and hold CLOCK button until hour digits flash. - Use UP/START or DOWN buttons to adjust hour. - Press CLOCK again to move to minutes, then seconds. - Press CLOCK once more to confirm and start. - In clock mode, press DOWN to toggle between 12-hour and 24-hour format. Countdown setup: - Press and hold SET button until digits flash. - Press SET repeatedly to select the digit to adjust (days, hours, minutes, seconds). - Use UP/START or DOWN to change value; hold for rapid adjustment. - Press SET until flashing stops to save. - Press UP/START to start or pause countdown. - Press and hold UP/START and DOWN simultaneously to reset to zero. Power: 2 x CR2032 batteries (included). Color: black/white. Material: ABS plastic. Dimensions: approximately 15.5 cm x 5.7 cm x 1.1 cm. Package includes: 1 x digital timer clock. Note: Color may vary slightly due to lighting and screen settings. Measurement tolerance: ±1–3 cm.