The Nemo system consists of three primary parts: a compressor that floats atop the surface, a swappable battery pack and, at the end of the 10-foot air hose, a “smart” regulator. It works hand in hand with the compressor to not just pump nonstop air, but actually match the pressure, volume and flow rate the diver needs at any given depth. The key is an internal silicone diaphragm that moves every time the diver breathes. A sensor measures that movement, sends a signal to the compressor, and air is pumped at the exact time and speed the diver is inhaling. In that sense the compressor doesn’t just push air to the diver but, as Nemo says, actually “breathes with you.” This approach allows the Nemo to use a reported one-tenth of the power needed by other underwater breathing systems. As such it requires only a 14.8-volt li-ion battery to provide about an hour of air time, and fully recharges in just three hours.