Mine fell off my helmet the other day on a job, went to go dump, then realized it an hour or two later as we were rolling up tools & ropes. Walked all around, couldn't find it. Probably had been in the Juniper bush rakings, gonzo forever. Enjoyed radio silence for 2 days before getting another one off a defunct helmet. Really terrible design, that model -- actual turn button volume knob that sticks out the back of the helmet, can snag on branches & limbs, and the clip mechanism is pretty weak.