Dual frequency four-channel can be used independently or in combination with Pre-modulated, Interferential, Russian and High Volt waveforms. Features: 1 and 3.3 MHz frequencies, 10%, 20%, 50% and continuous duty cycle selections with head warming. Bright-lit back LCD display. Includes soundhead and a 9 oz. bottle of Conductor Gel. 2 year warranty. Four channel electrotherapy system: Four waveforms; Interferential, Premodulated, High Volt and Russian. Bright back-lit LCD display. Includes Nylatex® wraps, both red and black 3" round electrodes and lead wires. High volt available on all channels. 2 year warranty.