Somewhat disappointing. At first I thought it was just broke or worthless. Once I replaced both of the 9-volt batteries that came with it, it at least started producing an audible tone that was somewhat usable. The tone generator was the other let-down. It produces a single tone instead of a two-tone signal. Because of that, I've had difficulty in determining weak tones (because of distance) from the background noise. It's probably because I've used a much better tracker before but I was pretty disappointed. Overall, if I need to do another project requiring a tracker, I'll probably buy a better one.