Long setting countdown time: 999 hours, 23 hours, 59 minutes and 59 seconds. Upgraded version with larger size. LCD screen size: 13.8 cm x 4 cm / 5.4 x 1.6 in. Alarm sounds for sixty seconds when the set time is reached. Includes clock function. Switchable between 12-hour and 24-hour formats. Easy to set and operate. Two placement options: magnetic back and adjustable bracket. Wide application for vacation, wedding, new baby, retirement, meeting, study, and more. How to set the clock: Press and hold the CLOCK button until the hour digits start flashing. Use the UP/START or DOWN button to adjust the hour. Press CLOCK again to move to minutes and then seconds. Press CLOCK once more to confirm and start. In clock mode, press the DOWN button to switch between 12-hour and 24-hour format. How to set countdown time: Press and hold the SET button until a number starts flashing. Press SET repeatedly to select the digit to adjust. Use UP/START or DOWN to change the selected number. Continue pressing SET until the display 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 1.1 cm Package Contents: 1 x Digital timer clock (Only the above content is included; other items are not included.) Note: Lighting and display differences may cause slight color variation between the image and the actual item. Measurement error allowed is +/- 1-3 cm.