Long setting countdown time: 999 days, 23 hours, 59 minutes and 59 seconds. Upgraded version: bigger size. LCD screen size: 13.8cm x 4cm / 5.4in x 1.6in. It will alarm for sixty seconds when reaching the set time. With clock function. Switchable between 12-hour and 24-hour formats. Easy to set. Two placement options: magnetic back and adjustable stand. Wide application: suitable for vacation, wedding, new baby, retirement, meeting, study, and more. How to set the clock: Hold the CLOCK button until the hour starts flashing. Press UP/START or DOWN to adjust the hour. Press CLOCK again to set minutes and seconds. Press CLOCK once more to confirm and start. In clock mode, press the DOWN button to switch between 12-hour and 24-hour formats. How to set countdown time: Hold the SET button until a number starts flashing. Press SET repeatedly to navigate to the digit you want to change. Use UP/START or DOWN to adjust the selected number. Press and hold for faster adjustment. Continue pressing SET until the screen stops flashing. Press UP/START to begin or pause the countdown. To reset to zero, press and hold both UP/START and DOWN buttons simultaneously. Requires: 2 x CR2032 batteries (included) Color: black Material: ABS Size: approximately 15.5 x 5.7 x 1.1cm Package Contents: 1 x Digital timer clock Note: Only the items listed above are included. Other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3cm.