InTENSity Select Combo II - 4-in-1 Electrotherapy TENS Unit with IF, NMES & RUSSIANInTENSity Select Combo II: Advanced Electrotherapy for Pain Relief & Muscle Recovery Unlocking the Power of Electrotherapy: The InTENSity Select Combo II The InTENSity Select Combo II is a state of the art portable electrotherapy device designed to provide effective pain relief and promote muscle recovery. This multifunction unit combines four modalities in one user friendly design, making it the ideal solution for at home, work, or on the go therapy.