Although it has never been a problem, every Tesoro that I have owned has "chirped" if I hold it parallel to the ground at waist high or so and twisted my wrist in sort of a fast motion. Almost like there is a short circuit somewhere, not sure why they chirp by doing that must be reading/picking up something. Like I say it does not interfer with performance but is very odd to me. All you Tesoro owners give it a try and let me know if yours does this. Thanks! Steve.