Aqualung's Transmitters, used in conjunction with a compatible wrist computer, allow you to monitor current pressure and gas time remaining without a stiff high-pressure hose, while providing a more streamlined profile. Hose-less gas pressure transmission for the i450T, i750T and i770R (see SKU's: UDRI450, UDRI750 and UDRI770). Once set, the transmitter is permanently paired and will not accidentally pair with other computers. Battery is user changeable and commercially available. 2 transmitter versions available: Nitrox compatible up to 40% or 100%. For O2 Transmitter see SKU: UDRT02.