An adventure should take you anywhere, any way you want to get there. That's why Suunto D4i gives you great freedive features as well as the option of a wireless readout of your tank pressure and air time. Go with your own dive inspiration - you'll be amazed at how far you can go on just one breath. The D4i Black comes with an elastomer strap and doesn't include a USB interface cable. Suunto Wireless Tank Pressure Transmitter is compatible with all Suunto air-integrated dive computers (except Suunto EON Steel), including D9, DX, D9tx, D4i, D4i Novo, D6i, D6i Novo, Vytec, Vytec DS, Vyper Novo, Vyper Air, and HelO2.