UNIVERSAL COMPATIBILITY - Tens unit pads have universal compatibility with all machines with pigtail connections. Flexible, comfortable, easy to apply, sticks on lasting comfort, and easy to peel off. Huge 40 piece set. ✔ SECURELY PACKAGED - Tens pads medical electrodes are packed in a resealable bag for durability. Compatible with all TENS and EMS units with pigtail connection. ✔ TRUSTED QUALITY - Tens reusable pads electrodes are used for electro stim TENS therapy, EMS, and electrode massager. Trusted self-adhesive reusable electrodes for tens unit. ✔ SAFE & NON-IRRITATING - Tens unit replacement pads build muscle, electric stimulation Estim electrodes. Our medical-grade reusable electrodes are latex-free and non-irritating to ensure users of all skin types have a safe, comfortable experience. ✔ 100% SATISFACTION GUARANTEED - Tens machine EMS unit pads use premium gel and latex-free that sticks firmly for a more reliable therapeutic current. Link :- https://santamedical.com/products/tens-unit-replacement-pads-2x2-40-pcs-premium-reusable-electrode-pads-self-adhesive-electro-therapy-patches-for-electrical-stimulation-non-irritating-stim-pads-design