I bought this AUVON Dual Channel USB chargeable TENS Unit ( ) it is ultra compact and has over 20 modes and 2 channels. I used it for my knee and other muscle pain. The size and weight is perfect for travel and can be charged with my usb chargers.

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It has built in timers and programs for different muscle group massages. You can also change the intensity and time of the programing or set custom rates. Its easier if you have someone assist you in putting it on, however over time you can do it yourself with practice.

Overall this AUVON Dual Channel USB chargeable TENS Unit ( ) i is a very good value for after workouts and tight muscles.

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