I've had 3 different wireless computers and they all averaged about 4 years of life, and all of them the senders went bad, the computers were still good. The senders went through about a battery every 8 months, which I didn'd really care since the bats are cheap but it was a bit of a hassle to make sure you had a bat in stock so I kept one in my seat bag. My wired job before those lasted 13 years, so remembering the good old days I went back to a wired computer and got a Sigma BC1609, but I've only had it a month so no long term report can be made, but it's a nice computer with backlight that my other computers never had.