This item is designed for indoor,semi-outdoor and outdoor counting down or up in hours minutes. You can also adjust the brightness according to the surrounding bright so that it will be comfortable for human eyes. Suggest the viewing distance within 15 meters. Max count up to 9 hours 59 minutes 59, which is countdown from 9:59 to 0:00 or count up from 0:00 to 9:59. Of course, you can edit any time and start a countdown or up. The case is designed non water proof. So, when you use outdoor, make sure that there is no rain or water get it wet.