Deep Kneading Shiatsu Cushion w Heat Jobst Relief 20 30 Knee Hi feels comfortable Style:1 Pair (Left & Right) feels comfortable 2 Channel Electrotherapy * 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 A complete and full massage experience * Deep Kneading Shiatsu Cushion with Heat * Traveling massage mechanism moves up and down the back for a relaxing massage * Soothing heat enhances your massage experience * 3 Massage Programs choose Full Back or isolate massage to Upper Back or Lower Back only * Corded remote control lets you customize your massage * Easy to use integrated strapping system fits most chairs * Notice to California Consumers: WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm *