Portable and high quality, convenient to use, this is what this days countdown clock it is. 1.8" high character, high quality red color seven segment, well design PCB and nice looking aluminum case, the clock stands out among others competitors. You can set to countdown or up for 999 days with this timer and you can also decide when it changes a day by setting a time in 24 hours. For example, you want it change a day at mid-night, pretty easy, just set it current time in 24 hours. Of course, this time is not displaying on the timer when it runs in days countdown, it only comes out when you edit it. Although this timer can just countdown 999 days, you can use it more than 10 years because of the long lifespan!