This little device really packs a punch! My sister purchased this first, and after using hers, I was in awe. It is battery operated, but don't let that fool you, it will light you up! I recommend starting out with the lowest setting and working your way up to see what is most comfortable for you. This is as effective as the electric systems that were used on me at my chiropractor's office (after a car accident injury), and the batteries surprisingly last a long time. I fully recommend this product, as it has saved me from having to go to my chiropractor as often, which in turn has saved a ton of money! It is an absolute godsend!

Easy to use. Would have liked a nice case, but happy with price. Would like a back-lit unit, but again, happy with price. I have a smaller unit that I thought I would give to a friend once I got this. But, my smaller unit will clip to a waistband and is nice to have for discrete portability if needed while away from home. The smaller unit does not have the convenient controls and easy to read interface this one has.