About Ocean Reef G Divers Portable Transceiver Surface Unit Only

The M100 G.divers is a portable surface transceiver unit that may be worn on the operator's belt. This is a high performance, compact, and easy to use unit. It is made to respond to the demands of communicating with divers in action without carrying expensive, complicated and heavy units. The size of the main unit is similar to a cell phone. The main unit has a PTT (Push to Talk) button and a headphone/microphone connector. The unit turns on when the headphone/microphone is connected to the main unit. The unit turns off automatically when the headphone/microphone is removed.

A 33' (10 meter) transducer cable connects to the main unit and is lowered into the water. The operator may control the depth of the transducer.

It operates on one channel 32.768 kHz and uses a 9V replaceable alkaline battery(not included) with autonomy of approximately 30 hours with a low battery alarm which beeps every 30 seconds when the battery is low (1-hour runtime remaining). The range of operation is approx 600' (200 meters). The unit comes with the following items: 33' (10 meter) transducer cable, headphone/microphone, and screwdriver. The M100 G.divers is covered by a 24 month limited warranty.

Warranty Information

This product has a limited warranty of 24 months.

(800) 922-1764

Ocean Reef G Divers Portable Transceiver Surface Unit Only Features

  • Ocean Reef G Divers Portable Transceiver Surface Unit
  • Surface Tender Waist Belt Mounted
  • Size of Most Cell Phones
  • Made to Respond to Demands of Communicating with Divers in Action
  • No Carrying Expensive, Complicated and Heavy Communication Units
  • Activation: Plug-In Headphone/Microphone Turns It On
  • Unit Turns Off Automatically when Headphone/Microphone Removed
  • Operates on One Channel: 32.768 kHz
  • Power: 9V Replaceable Alkaline Battery (not included)
  • Low Battery Alarm:
    Activates at 1-Hour Power Reserve
    Beeps Every 30-Seconds when Battery Low
  • Total Battery Life: Approximately 30-Hours
  • Maximum Operational Range: 600' (200 meters)
  • Includes:
    33' (10 meter) Transducer Cable
  • 2 Year Limited Warranty

Ocean Reef G Divers Portable Transceiver Surface Unit Only Specifications

Through-Water Transmission
Yes, Wireless Ultrasonic
Range (Feet/Meters)
600' (200 meters)
Standard Frequency (PEP)
32.768 kHz
Battery Type
9V Alkaline (not included)
Weight [with packaging]
2 lb
Mfr #

G Divers Portable Transceiver Surface Unit Only Customer Reviews

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by PowerReviews
Ocean Reef G Divers Portable Transceiver Surface Unit Only Black (M-100)

(based on 1 review)

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Reviewed by 1 customer

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works great

By Steve

from Edenton N.C.

About Me Advanced

Verified Buyer


  • Easy To Use
  • Functional
  • Improves Diving Experience
  • Lightweight
  • Solid Construction


    Best Uses

      Comments about Ocean Reef G Divers Portable Transceiver Surface Unit Only Black (M-100):

      we use 2 of these for a pubic saftey dive team

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      • No

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      Questions & Answers Powered by TurnTo®

      Questions about this item:

      Jonathan H  I currently have the Ocean Reef Raptor Full Face mask with the communications mounted on it. Does this surface unit contain everything I need to be able to communicate from diver to surface?
      Marilyn S  This will have all you need. If you want to talk with the surface the M100 will allow you to talk from the surface with any diver using an OCEAN REEF underwater transceiver (GSM Gdivers , GSM DC , GSM GPower etc. )
      Shopper  Is this device compartible with OCEAN REEF - NEPTUNE MASK + COMMUNICATION SYSTEM KIT - NEPTUNE II NIRA & GSM?
      Monica s  Yes.
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