Enjoy the convenience of air integration without the hassle of a dangling hose. The low-profile transmitter screws into a high pressure port on your first stage and relays tank pressure and true remaining bottom time (RBT) to the computer screen. Featuring a more visible built-in LED on top of the cap, it provides an estimate of tank pressure when the first stage is attached to a tank letting you know if the tank has gas without needing to activate the computer. Compatible with the HUD, G2 and A2 personal dive computers