Long setting countdown time: 999 days, 23 hours, 59 minutes and 59 seconds.Upgraded version: bigger size. LCD screen size:13.8cmx4cm/5.4x1.6in.It will alarm for sixty seconds when arriving at your setting number.With clock function. You can switch between 12 and 24 hours systems.Easy to set.Two ways to place it. With magnet back and movable bracket.Wide application: vocation, wedding, new baby, retirement, meeting, study, and so on.How to set clock:Hold the CLOCK button until you see the clock number "hour" start flashing.PrUP/START or DOWN to adjust that particular number.Keep hitting CLOCK to set minutes - seconds.PrCLOCK again to start.In the CLOCK mode, prthe DOWN button to switch between 12 and 24 hours systems.How to set countdown time:Hold the SET button until you see a number start flashing.Push the SET button until you get to the number you want to change.PrUP/START or DOWN to adjust that particular number. Hold UP/START or DOWN, the number will change quickly.Keep hitting SET until the screen stops flashing.Prthe UP/START button to start or pause the counting down.Prand hold the UP/START and DOWN buttons at the same time to reset to 0.Requires: Internal 2 x CR2032 batteries (Included)Colour: whiteMaterial: ABSSize: about 15.5x5.7x1.1cmPackage Contents:1 * Digital timer clockOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.