OMRON Gel Refills include 3 pairs (6 pieces) of conductive gels designed for use with the OMRON Heat Pain Pro (PM311). Each pair can be used up to 30 times on the device's permanent pads before replacement is needed. These gels heat up to 110°F, delivering soothing, targeted warmth to help relax sore, achy muscles. The OMRON Heat Pain Pro is the only device on the market that combines therapeutic heat with TENS (Transcutaneous Electrical Nerve Stimulation) technology to relieve acute muscle and joint pain. It offers customizable, drug-free pain relief with options for alternating heat and TENS therapy, TENS-only treatment, six preset body pain modes, three massage modes, and 20 adjustable intensity levels. Safe and effective, Heat Pain Pro allows you to manage pain throughout the body without the side effects of medication—helping you stay active and feel your best.