I don't get these reverse beepers anymore. With current video technology, I say make the beepers illegal and change the requirement to having a reverse video camera, and a somewhat competent operator, on vehicles that otherwise would be equipped with a beeper, and anything down to a chimp or lower at the controls.
All the beepers do, IMO, is create a bunch of noise pollution and take the onus off the operator for looking where the F--- he is going, or getting a spotter.
/rant.