Use CVS Health Advanced TENS Replacement Pads with your CVS health Advanced TENS Targeted Muscle Therapy unit. Each pad is fully flexible, durable, and reusable and can be used up to 20 times before the need for replacement. Use them on the lower back, shoulders, elbows, thighs, knees, calves, and ankles to get muscle pain relief support. This item is FSA eligible. When using these TENS replacement pads, it's important to carefully follow the instructions. Never place the electrode pads over the neck, across your chest, over open wounds or rashes, or over inflamed areas of skin eruptions. You should also never place the pad over any red, inflamed, or infected areas of the skin. Do not place them near any cancerous lesions. Be sure to keep the pads as they are and never modify the size or shape in any way. Each electrode pad is reusable up to 20 times if you properly care for and store it. The pads must be used within one month after opening the seal. Never apply this treatment for more than one full hour at a time. Once the pads have been used 20 times, dispose of them in a safe and sanitary manner. Do not share these pads with other people as they are intended for individual use only. Only use them with the CVS Health Advanced TENS Muscle Therapy unit for best results. With proper use, you'll get the relief support you may need from minor muscle aches and pains. HSA/FSA EligibleReusable, with up to 20 uses per padFlexibleDurable4-count package