OCEAN REEF G DIVERS M-101A UNDERWATER RECEIVING UNIT
The M101A G.DIVERS is a receive-only unit operating on one channel. The M101A fits on any conventional mask strap or full-face mask model. It might be held and shared by more divers thanks to the high-quality speaker. The M101A uses a 9V alkaline battery and has a “low battery” alarm which beeps every 30 seconds when the battery is low.