I don't know if I've got a mean streak of bad luck or if I need to be questioning the quality of scuba pro transmitters but I've had two now since December that were duds. The first one was dead right out of the box. Battery was good but the transmitter wouldn't come on. Sent it back, got a replacement and it came on and paired! Great, so I go to the pool to try it our and play around and it works great. Fast forward to today I try to use it for the second time and yep....dead dead dead. Checked the battery, all good there so this ones going back too I guess.