The robust and lightweight Suunto D4i Novo for diving and everyday wear comes with a comfortable silicone strap. It includes four dive modes (air, nitrox, freedive and gauge) as well as timer and watch functions. Optional wireless tank pressure reading and graphical dive logs offer a friendly user experience. The 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 you're good to go. The transmitter's handy green LED light lets you know that it's on. Suunto Wireless Tank Pressure Transmitter is compatible with Suunto D9, DX, D9tx, D4i, D4i Novo, D6i, D6i Novo, Vytec, Vytec DS, Vyper Novo, Vyper Air, and HelO2. Always ready to descend when you are.