This Oceanic Transmitter will work with many of Oceanic’s computers that are air integrated. If you have an OC1, Atom 1.0, 2.0 & 3.0, VT, VT3, V, VT, VT3 and VT4 and want to upgrade or need to replace your transmitter this item is what you want. Each compatible Oceanic Hose-Less Air Integrated Computer may be programmed to link with up to 3 independent transmitters. The transmitter has a user replaceable 3v CR2 battery and is installed to your regulators 7/6_ threaded high pressure (HP) port.