General description The Big Digital Countdown Days Timer Clock is an upgraded version featuring a long countdown time of up to 999 days, 23 hours, 59 minutes, and 59 seconds. It is designed for various applications such as graduations, weddings, new babies, retirements, meetings, and study sessions. The clock includes a built-in alarm that sounds for sixty seconds when the countdown reaches zero. Technical specifications Countdown time: 999 days, 23 hours, 59 minutes, 59 seconds LCD screen size: 13.8 cm x 4 cm (5.4 in x 1.6 in) Overall size: approximately 15.5 cm x 5.7 cm x 1.1 cm Requires: 2 x CR2032 batteries (included) Material: ABS Color: Black Measurement allowed error: +/- 1-3 cm Installation Two placement options: magnet back and movable bracket Usage To set the clock: Hold the CLOCK button until the hour starts flashing, then use UP/START or DOWN to adjust the hour. Repeat for minutes and seconds, then press CLOCK to start. To switch between 12 and 24-hour systems: In CLOCK