The Intelect Legend XT 4 Electrotherapy Unit is the most advanced electrotherapy system available. Beneath its award-winning, ergonomic design is a sophisticated, versatile, user-friendly system. Multiple waveform electrotherapy – 6 clinical waveforms: Interferential, Premodulated, High Volt, Russian, Symmetrical Byphasic, and Microcurrent. Four independent electrotherapy channels.