Suunto Transmitter with LEDThe Suunto Wireless tank pressure transmitter gives you current tank pressure and remaining air time with just a glance at your wrist. Before your dive, simply pair the transmitter with your dive computer and youre good to go. The transmitters handy green LED light lets you know that its on. Suunto Wireless Tank Pressure Transmitter is compatible with all Suunto air integrated dive computers (except Suunto EON Steel), including D9, DX, D9tx, D4i, D4i