The TriggerPoint CHARGE VIBE Vibrating Massage Roller helps to reduce the sensation of pain and provides a quicker muscle recovery process. Designed with elevated and opposing curves to replicate effective massage therapy techniques, the high and wide ridges stretch the muscle while the high and narrow ridges squeeze the muscles as you roll. This rhythmic squeeze and stretch motion helps push blood and oxygen to damaged tissue, resulting in a faster transfer of nutrients needed to repair sore muscles and accelerate post-workout recovery. The unit's built-in battery can last up to two hours when fully charged. Measures 7" long, with a 4-inch diameter, and weighs 2 lbs. The compact CHARGE VIBE is portable and can fit into most gym bags and suitcases. Includes an AC charger. Owner's manual features instructions for use and examples. Includes 1-year manufacturer's warranty. TriggerPoint empowers people of all lifestyles to move and feel better. TriggerPoint designs and develops innovative massage therapy tools that mimic the touch of a therapist's hands making their foam rollers, hand rollers, massage sticks and balls ideal for individuals of all ages, sizes, and athletic ability.