Features Dual channel (4-lead) digital Electronic Muscle Stimulator (EMS) High-tech design with metallic finish and LCD display 3 Treatment Modes (Constant, Simultaneous, Alternating) Stronger 100 mA amplitude Treatment timer (1-60 minutes or Continuous) Last setting recall Compliance monitor The Medi-Stim Comfy EMS Unit is a dual channel, (4-lead), digital electronic muscle stimulator. It features a high-tech design with a metallic finish and LCD display. Also, it contains 3 treatment modes including Constant, Simultaneous, and Alternating. This specific unit comes with 1 Medi-Stim Comfy EMS Unit, 1 package of 4 reusable, self-adhering, electrodes, 1 set of 43" pin leadwires, 1 9V heavy-duty battery, a carrying case, and an instruction manual! Specifications Technical Channels: Dual, isolated between channels Wave Form: Asymmetrical Biphasic Square Pulse Amplitude: 0-100 mA (peak to peak into 500 ohm load each channel) Output Voltage: 0 to 50V (500 ohm load) Modes: C (Constant), S (Synchronous), A (Alternating) Pulse Rate (Frequency): 2 - 150 Hz, 1 Hz/step Pulse Width (Duration): 50 - 300 microseconds (?s), 10 ?s/step Contraction (On) Time: 2 - 90 seconds, 1 sec/step Relaxation (Off) Time: 2 - 90 seconds, 1 sec/step Ramp Up/Down Time: 1 - 8 seconds, 1 sec/step (The "On" time will increase and decrease in the setting value) Treatment Timer: 5 - 60 minutes or Continuous (C), 5 min/step Compliance Usage Meter: Records up to 60 sessions, up to 999 hours Low Battery Indicator: Battery symbol appears when battery power is low Power Supply: One 9 Volt Battery Size: 4" (L) x 2.4" (W) x 1" (D) Weight: 5.2 oz. with battery Additional Information 3-year warranty Heavy duty metal belt clip Hinged protective cap for intensity dials Low Battery power indicator