The max count days is 1000 days(999 days 23 hours 59 minutes 59 seconds) Excellent brightness and visibility for indoor activities Easy mount to wall/table/ceiling Dimension: 34cm W x10cmH x4cmD / 13.5"W x 4"H x1.6"D Weight:0.7kg AZOOU 1-inch 9Digits LED Event Timer Countdown/up Clock with Days Hours Mins Secs Max Up to 1000 Days Red Color This large 1-inch event timer is used to count down or count up a special day in days/hours/minutes/seconds.For example, if you have 999 days to complete a project you can use it to monitor your progress or you want to count down to Xmas or New Years day or Sport Events etc.Similarly you can set the timer to count up to a particular day. The Countdown and Count up operates up to 1000 days.This timer has a bright red LED, easy to read display from any distance, this is pretty helpful especially when the clock is mounted out of reach; It works under 6VDC, the power adapter is 100v-240vac input and 6VDC output. Low power consumption . The brackets comes with the clock are screwed to the both sides of the clock.