Long countdown timer setting: up to 999 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 compatible with 60 seconds when countdown completes. Built-in clock function with 12-hour and 24-hour compatible withmat selection. Simple and intuitive operation. Dual mounting options: built-in magnet and adjustable stand. Versatile use: vacation, wedding, newborn celebration, retirement, meetings, study, and more. Clock setup instructions: - Press and hold CLOCK button until hour digits flash. - Use UP/START or DOWN buttons to adjust the flashing digit. - Press CLOCK repeatedly to cycle through hour, minute, and second settings. - Press CLOCK again to confirm and start clock operation. - In clock mode, press DOWN to toggle between 12-hour and 24-hour compatible withmat. Countdown setup instructions: - Press and hold SET button until a digit flashes. - Press SET repeatedly to select the digit to adjust. - Use UP/START or DOWN buttons to change the selected digit. - Press SET repeatedly until flashing stops to confirm settings. - Press UP/START to start or pause countdown. - Press and hold UP/START and DOWN simultaneously to reset countdown to zero. Power: 2 x CR2032 batteries (included). Color: 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: Actual product color may vary slightly due to lighting and screen display differences. Measurement tolerance: ±1–3 cm.