This tens machine is quality grade professional,built extremely well and very easy to use.I suffer from lyme,and because of that nerves and muscle pain come with it.this tens machine offers a ton of relief for my aches and pains.snice the very first moment used I show signs of relief.I am thankful for the opportunity to test this product and I want to thank the seller for the chance .normally tens machines are not rechargeable or at least the ones I have had in the past.this product is light weight very easy to use and is fully rechargeable. Had a led screen to make seeing the screen so much easier.comes with extra pads and has two channels to individually have each on a differnt setting.