Trigger Point Charge Vibe Sports Medicine : The Trigger Point CHARGE(TM) Vibe features a unique CHARGE(TM) design and vibrating massage technology to help speed up the muscle recovery process. This roller features a compact size and elevated and opposing curves to mimic the massage therapy techniques used by therapists. A multi-speed vibration helps deliver a more powerful massage experience for faster relief and recovery. Benefits Unit offers a premium massage. Features 3 vibration frequencies. Rechargeable; AC charger included. Measures 7 x 4 inches and weighs 2 pounds; rechargeable battery can last up to two hours. Features high and wide ridges to stretch and high and narrow ridges to squeeze muscles, increasing circulation to hard-to-reach muscle tissue.