Long countdown timer: up to 999 days, 23 hours, 59 minutes, and 59 seconds. Upgraded version 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 display options. Simple and intuitive operation. Dual mounting options: built-in magnet back and adjustable stand. Versatile use: vacations, weddings, new year, retirement, meetings, study sessions, etc. Clock setup instructions: - Press and hold the CLOCK button until the hour digits flash. - Use UP/START or DOWN buttons to adjust the hour. - Press CLOCK again to move to minutes, then seconds. - Press CLOCK once more to confirm and start the clock. - In CLOCK mode, press DOWN to toggle between 12-hour and 24-hour format. Countdown setup instructions: - Press and hold the SET button until a digit flashes. - Press SET repeatedly to cycle through days, hours, minutes, and seconds. - Use UP/START or DOWN to adjust each value; hold to scroll quickly. - Press SET until flashing stops to save settings. - 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 or 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: Due to lighting conditions and screen variations, actual product color may differ slightly from images. Measurement tolerance: ±1–3 cm.