Maximum countdown time: 999 days, 23 hours, 59 minutes and 59 seconds. Design: Larger size. LCD screen size: 13.8cm x 4cm / 5.4 x 1.6in. Alarm duration: sixty seconds when countdown ends. Clock function. Switch between 12 and 24 hour formats. Mounting options: Magnet back and movable bracket. Suitable for: vacation, wedding, new baby, retirement, meeting, study, and more. Setting clock: Hold CLOCK button until hour starts flashing. Press UP/START or DOWN to adjust number. Press CLOCK to set minutes and seconds. Press CLOCK again to start. In CLOCK mode, press DOWN to switch between 12 and 24 hour formats. Set countdown time: Hold SET button until number starts flashing. Press SET until target number appears. Press UP/START or DOWN to adjust. Hold UP/START or DOWN for quick change. Press SET until screen stops flashing. Press UP/START to start or pause counting down. Press and hold UP/START and DOWN together to reset to 0. Power Source: 2 x CR2032 batteries (Included) Color: black/white Material: ABS Size: approx. 15.5 x 5.7 x 1.1cm Package Contents: 1 * Digital timer clock 2 x CR2032 batteries Note: Product color may vary from images due to monitor settings. Measurement tolerance is +/- 1-3cm.