Long setting countdown time: 999 days, 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 with switchable 12-hour and 24-hour display formats. Easy to set and operate. Two placement options: magnetic back and adjustable stand. Suitable for a wide range of applications such as vacations, weddings, newborns, retirement, meetings, and study sessions. 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, 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 formats. How to set the countdown timer: Press and hold the SET button until a number starts flashing. Continue pressing SET to navigate to the digit you wish to change. Use the UP/START or DOWN button to adjust the selected value. Press SET repeatedly until the display stops flashing to complete setup. Press UP/START to begin or pause the countdown. To reset the timer to zero, press and hold both UP/START and DOWN buttons simultaneously. Powered by 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 Note: Other items not included. Note: Lighting and display settings may cause slight color variations between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.