Tested the watch. Here's how the battery held: 26.01-100% 27.01-100% 28.01-75% 29.01-75% 30.01-75% 31.01-75%-50% (by evening) 01.02-50%-75% (by evening))) 02.02-50% 03.02-50%-25% (p.m.) 04.02-25%-0% (by evening) and (at night turned off) Screen resolution is cool. General feeling cool. Throwing up the hand, the screen turns on. The dials are only three. It will not work to install its own. The menu is extremely simple. Only the most basic and all. Logical for such a price.