This computer worked well for one set of batteries. The one exception is the auto-on function which never worked.After the first battery change (transmitter and receiver at the same time) the computer did not work as long. Upon subsequent changes the computer did not work at all. It would either not pick up the transmitter at all or read, at best, inacurately.I came across it again while shopping for a replacement (Cateye) and decided to write this review. Buy something else.