This particular device is dual Channel small and portable and runs on batteries. The good part about that is you can bring it with you anywhere and as long as you have replacement batteries you can keep the device working. It’s not rechargeable so you might go through quite a lot of batteries. If you plan on using it for prolonged periods of time a rechargeable unit might be better for you and this brand also offers that type of device as well.
The difference between this and most standard massagers is that rather than just vibrate to attempt to alleviate your pains this one electromagnetic pulses directly to the muscle that is causing you pain. the controls are fully adjustable so that you can set your own intensity as well as massage type.