Polysonic® Ultrasound Lotion, 1 Gallon(s) Lighting 2 Channel Combination * Easy to add modularity 18747 2 Channel Combination * Easy to add modularity allows the addition of two additional channels of electrotherapy light therapy or a battery module * High contrast 5 (13 cm) FSTN LCD monochromatic user interface * Two independent electrotherapy channels expandable to four independent channels * Multiple waveform electrotherapy six clinical waveforms: Interferential Premodulated High Volt Russian Symmetrical Biphasic and Microcurrent * Documentation of treatment data with Patient Data Cards * User defined protocols for your specific needs * Dual frequency ultrasound at 1 or 3 Latex free * Applies easily * Reusable * Amazing retail packaging * 12 Long * 7 No formaldehyde 1 gallon jug does not include a dispenser pump