Perfect for Larger Areas: AVCOO rectangular TENS pads help pain relief by covering greater surface areas and hitting more muscle groups: back, thigh, shoulder, arm, hip, etc..Premium Electrodes: AVCOO latex-free TENS unit electrode pads adopt industry-leading American gel to ensure excellent stickiness for over 50 reuses. (CE, RoHS certified and FDA cleared.).Universal Compatibility: AVCOO TENS unit muscle stimulator pads are widely compatible with all TENS/EMS devices that use the snap-on leads with a 3.5mm connector..Thoughtful Design: The unique tab makes TENS machine pads easier to remove with no gel damage. The double-sealed packaging helps extend the pad lifespan and ensures the pads are delivered unopened..Beyond A Purchase: We're committed to provide the best products and service to our customers. For any questions about the product, please feel free to contact us.