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Inside the SmartRelief Back Pain Therapy Kit is the battery-powered electrical TENS unit. It's about half an inch thick and smaller than a credit card. It has an ON/OFF switch with a small LED light to let you know the unit is on and the battery is good.
You'll also get one adhesive pad (specifically designed for the back) and a battery. The electrical unit simply snaps onto the back of the pad, then the pad is placed onto the skin over the area in pain.
Replacement pads are available in packs of 2, and each pack comes with a 3-volt battery.
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