Long countdown timer setting: 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). ble alarm sounds for 60 seconds when countdown completes. Built-in clock function with 12-hour and 24-hour time format selection. Simple and intuitive button operation. Dual mounting options: integrated magnet back and adjustable stand. Versatile use: vacations, weddings, retirement celebrations, meetings, study sessions, and more. Clock setup: - Press and hold CLOCK button until hour digits flash. - Use UP/START or DOWN buttons to adjust hour value. - Press CLOCK again to move to minutes, then seconds. - Press CLOCK once more to confirm and start clock. - In clock mode, press DOWN to toggle between 12-hour and 24-hour display. Countdown setup: - Press and hold SET button until first digit flashes. - Press SET repeatedly to cycle through days, hours, minutes, and seconds. - Use UP/START or DOWN to adjust each value; hold button for rapid adjustment. - Press SET repeatedly until flashing stops to save 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: Black. Material: ABS plastic. Dimensions: Approximately 15.5 cm x 5.7 cm x 1.1 cm. Package includes: 1 x Digital timer clock. Note: Screen brightness and device display settings may cause slight color variation. Measurement tolerance: ±1–3 cm.