Bought a second one for my son. I've been wearing this model for over 3 years. I use the backlight and alarm clocks all the time, while I have never changed the battery yet, although I read about them on the forums that I used to have to change every year. Apparently, the electronic module has been upgraded. The accuracy is not bad, they go ahead by 10 seconds in a month. Not Elektronika 54, of course, but also not bad.