This tank pressure wireless transmitter (OEM by Pelagic Pressure Systems = FCC ID MH8A), is compatible only with those specific models of Shearwater Research, Hollis, Oceanic, and Aeris brand dive computers that support hoseless air integration. This includes the Shearwater Perdix-AI, Teric and NERD 2 model dive computers but does NOT include the Shearwater Peregrine or Perdix without the AI designation. 

The transmitter is rated for depth up to { 500 ft | 150 m }, and has a user replaceable, widely available, CR2 photo battery.

Each transmitter has its own unique ID and multiple transmitters can be linked to compatible dive computers (up to two for the Shearwater) . The transmitter is available in two different case colors that indicate slightly different timing of the data transmissions although both colors use the same 38kHz radio frequency. 

In single transmitter applications we recommend the charcoal grey color. In two transmitter applications such as sidemount or CCR, Shearwater recommends using the yellow color as the second transmitter to minimize interference with each other. (Our transmitters are of recent manufacture and our yellow stock is NOT subject to the 2018 recall.) Using two of the same color transmitter may cause interference between the two transmitters that results in loss of communications about tank pressure.

Shearwater supplies the transmitter with a small zippered hard case. The Shearwater case included with the transmitter is a very snug fit, suitable for dry storage, but not suitable for boat use or damp storage. If you want a well padded case suitable for boat use and with room for storage of the dive computer and transmitter together, consider using the optional DGX Padded Storage Bag.

The transmitter screws in to a high-pressure (HP) port of the first stage regulator mounted on the tank to be monitored. An antenna inside the dive computer receives the signals when it is positioned within { 72 in (6 ft) |1.8 m } of the transmitter and within a zone parallel or at a 45 degree angle to the transmitter. Best reception is achieved when the dive computer and transmitter are within { 3 ft | 0.9 m } of each other. During a dive you may at times move the dive computer so that is out of the signal pattern of the transmitter, resulting in a temporary interruption of the link. The link may also be interrupted if the dive computer is within { 3 ft | 0.9 m } of a running DPV or after a strobe light flashes. The link will be restored within 4 seconds after the dive computer is reoriented, moved back into range, or the interference clears.

In rare cases, the body of some first stage regulator designs will have hose ports oriented such there is not room to accept a wireless tank pressure transmitter without interfering with hose routing. The solution is to use a standoff adapter, or some divers prefer to use a short 6-inch HP hose pigtail (do not forget the required Air Spool)in place of the standoff.

NOTE: The transmitter has a user replaceable, non-rechargeable and widely available CR2 photo battery. The high pressure o-ring located at the base of the transmitter is a standard size AS568-012, Viton material while the battery cap o-ring used is size AS568-016, Nitrile (Buna-N) A70. Under normal circumstances neither o-ring requires routine replacement.