DEVICE: Electronic Muscle Stimulator Unit EMS TS-1311 DIGITAL with DUAL CHANNELS These digital TENS units are ideal drug-free alternatives for pain management. Helps with muscle and joint pain. Includes lead wires, 4 self-stick high quality electrodes, 9V battery, hard plastic carrying case and instruction booklet. Features Dual channel (4-lead) digital muscle stim 3 treatment modes (Alternating, Synchronous, or Constant) Adjustable rate & width, contraction/relaxation times, and ramp up/down Clear protective cap for intensity dials Treatment timer & compliance monitor Last setting recall Low battery indicator 1-year warranty Comes with 1 pkg of 4 reusable self-adhering electrodes, 1 set 43” pin lead wires, 1 each 9V heavy duty battery, carrying case, and instruction manual Technical Specifications Channel: Dual, isolated between channels Amplitude: Adjustable, 0 - 80 mA peak across 500 ohm load Output Voltage: 0 - 40V across 500 ohm load Waveform: Asymmetrical biphasic square pulse Pulse Rate:Adjustable, 2 - 120 Hz Pulse Width: Adjustable, 50 - 300 µS Modes: Synchronous, Constant, AlternatingSynchronous (S) Channels 1 and 2 stimulate ON and OFF together at the same time. ON and OFF times apply to both channels.Constant (C) Channels 1 and 2 stimulate ON continuously at the set pulse rate. ON time, OFF time, and Ramp do not apply to either channel.Alternating (A) Channel 1 stimulates ON first, then the stimulation immediately alternates to Channel 2. At the end of Channel 2 cycle, then both channels are OFF for the set OFF time. Timer: Adjustable 5 - 90 minutes in 5 minute increments, or Continuous Contraction Time: Adjustable, 2 - 99 seconds Relaxation Time: Adjustable, 2 - 99 seconds Ramp Up/Down: Adjustable, 1 - 8 seconds Power Supply: One 9-volt DC battery Size: 10 x 5.9 x 2.4 cm Weight: 130 grams with battery Important information Legal Disclaimer : Caution: This unit is not a medical device and is not intended to diagnose or treat any medical condition or disease. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. This product should be used for sports and aviation only.