InTENSity Select Combo II Portable Muscle Stimulator with 4 Waveforms Includes: Carrying Case Lead Wires, 45", 2/pk Lithium-Ion Battery InTENSity Electrodes, 2" x 2", Mini 4/pk AC Charger The InTENSity Select Combo II muscle stimulator offers patients four modalities in one user-friendly design: Transcutaneous Electrical Nerve Stimulation (TENS), Neuromuscular Electrical Stimulation (NMES), Interferential Current (IFC), and Russian (RUSS). Equipped with preset body-part-specific settings, it guides the patient step-by-step to the ideal therapeutic treatment. 2 channels of independent stimulation output 4 Waveforms: TENS, NMES, IFC, and RUSS Manual customizable settings and preset body-part-specific settings for neck, shoulder, hand, knee, foot, and lower back pain – a total of 72 programs. 4 stimulation modes for TENS Synchronous mode for NMES with adjustable pulse amplitude, pulse frequency, and contraction / relaxation time parameterLead Cord tester for on-board diagnostic testing Up to 10,000 Hz of IFC therapy with sweep frequency to prevent accommodation of nerves and provide maximum treatment benefits 2500 Hz of RUSS for deep and comfortable muscle stimulation Store up to 90 sets of treatment records and total treatment time of 100 hours Rechargeable lithium ion battery with USB/wall charger One-year warranty Rx only TECHNICAL SPECIFICATIONS Power 3.7 V Lithium Rechargeable Battery Pack Waveforms TENS, NMES, IFC, Russian