The Suunto Wireless Tank Pressure Transmitter can be used with all Suunto air-integrated dive computers (except the EON & D5 models). With a simple glance at your wrist-mount computer, you will be able to read remaining tank pressure and air time. The battery is calculated to last approximately 2 years, with ca. 100 dives per year.The pairing is really simple and after pairing you can just jump right into your dive. The transmitter features a handy green LED light, to inform you that it is switched on.