The manual is actually pretty amazing at explaining how to set this watch. I’ve had this watch over a year, and I haven’t had any issues. I’m a nurse and was worried that the hand sanitizer would yellow the color of the watch, so far it hasn’t. I even use the CHG wipes on it and it hasn’t hurt it. I haven’t had any issues with the band holding moisture against my skin, big plus. The band is breathable. This is actually the second one I’ve purchased! My last one was white, it still works but part of the band broke off and there is no replacing it… You will find no replacement parts for this watch.