In the past few years, we have covered plenty of EMS and TENS units that can relieve pain in your body. The SixPad Knee Fit is an EMS thigh muscle trainer that works the muscles around your knees. It has 20 level for you to choose from. This wearable thigh trainer has 20Hz EMS frequency. It weighs only 2.4oz, so you can wear it comfortably.
You can get this in 3 sizes. The device has eledyne fabric electrodes that just need to be wet with water.