I bought this to replace a less expensive version of a very similar, non-solar Casio watch. That watch failed after 1 year. The solar watch aspect I view as a limitation because it is best charged off wrist in a window, usually when I want to use it! The negative consequence of the limited power supply is a very, very weak alarm,-its barely audible. This is MUCH worse than it battery powered counterpart which I valued as a morning wake up call. Unfortunately that watch has a cheap (plastic) case whose metal coated finished looked good at first, but quickly disappeared, not to mention the watch continually reset itself.