Ocean Reef GSM G.divers Underwater Wireless Communication System - Masks, Full Face Masks

Simple PTT (Push To Talk) system - press the microphone button to talk and release to receive Standard frequency - making it possible to talk directly with all other Ocean Reef communication systems Powered by a 9 volt battery  - not included (see below to order) Up to 30 hours in the receiving mode Range of up to 600 feet  The underwater communication allows a great evolution of the diving activity and an outstanding improvement of the underwater instruction and education. Besides, the underwater communication is also making the diving activity safer and more enjoyable.  The new GSM G.divers transceiver (high performance communication system) expands the diver's ability to communicate with others verbally  The ultrasonic transceiver boasts the autonomy of approximately 30 hours in receiving mode, a range of operation of 200-250 meters (calm sea water), lightweight and sleek design. It is a powerful, single channel and inexpensive PTT (push to talk) underwater wireless communication unit. The unit automatically activates upon contact with the water and it uses a 9V alkaline battery with a low battery alarm which beeps every 30 seconds when the battery is low.  The GSM G.divers communication unit is the perfect addition to any training class or guided tour and operates on the same frequency as all other OCEAN REEF units and most popular wireless communication units on the market.  GSM G.divers uses a D-Mic, a special microphone with the housing sealed by hydrophobic membrane which is permeable to air, but prevents water from passing through the electronics  The membrane's reduced thickness limits any reduction of the vocal signal. The permeability of the membrane keeps the internal pressure equalized with the external pressure, enabling the microphone to be used at practically any depth.  Each GSM G.divers comes with the NACS (Neptune Adjustable Communication Support) (code 33054). The patented NACS is an adjustable support arm for the GSM G.divers and other OCEAN REEF under