Long countdown time setting 999 days, 23 hours, 59 minutes and 59 seconds.Upgraded version larger size. LCD screen size 13.8cm4cm5.41.6in.It will ring for seven to ten seconds when it reaches your set number.With clock function. You can choose between 12 and 24 hour system.Easy to set up.Two ways to place it. With magnetic back and movable mount.Wide application vacation, wedding, retirement, meeting, study and so on.How to set the clockHold down the CLOCK button until you see the hour number start flashing.Press UP or DOWN to adjust the specific number.Continue pressing CLOCK to set minutesseconds.Press CLOCK again to start.In CLOCK mode, press the DOWN button to select between 12 and 24 hour system.How to set the countdown timeHold down the SET button until you see a number start flashing.Press the SET button until you reach the number you want to change.Press UP or DOWN to adjust the specific number. Press and hold UP or DOWN to change the number rapidly.Continue pressing SET until the screen stops flashing.Press the START button to start or pause the countdown.Press and hold the START UP and DOWN buttons simultaneously to reset to 0.Requires Internal 2CR2032 batteries includedColor blackMaterial ABSSize approx 15.55.71.1cmPackage contents1Digital timer clockOnly the above package contents, other products are not included.Note Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is13 cm.