Shearwater Research HP Wireless Transmitter (Perdix-AI);

This tank pressure wireless transmitter (OEM by Pelagic Pressure Systems), is compatible only with those specific models of Shearwater Research, Hollis, Oceanic, and Aeris brand dive computers that support hoseless air integration. Each low frequency RF 38kHz transmitter has its own unique ID and multiple transmitters can be linked to compatible dive computers (up to two for the Perdix-AI) . The transmitter is charcoal in color, rated for depth up to { 500 ft | 150 m }, and has a user replaceable, widely available, CR2 photo battery. 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.