The TriggerPoint CHARGE VIBE Ridged Vibrating Portable Foam Roller is a vibrating foam roller with opposing ridge curves, and three vibration frequencies specifically calibrated to ease muscle pain and discomfort, and accelerate recovery. High and wide ridges stretch the muscle as it’s rolled, while high and narrow ridges squeeze the muscle to increase circulation, pushing blood and oxygen throughout the body, resulting in a faster transfer of the nutrients needed to repair damaged tissue. The rhythmic squeeze and stretch motion provided by the elevated CHARGE pattern, in combination with the vibration technology provides a comfortable release of muscle tension, for a powerful massage experience that helps to recharge muscles after training. Ideal for use immediately following physical activity; roll upper and lower body including calves, adductors, quadriceps, hamstrings, and upper back. The TriggerPoint CHARGE VIBE Ridged Vibrating Portable Foam Roller is compact and portable—measuring just 7 x 4 inches and weighing 2 pounds, it fits in most gym bags. The unit’s built-in, rechargeable battery can last up to two hours when fully charged (battery life is dependent on the level of vibration frequency the roller is set to). Includes an AC charger and owner’s manual with detailed instructions for use. Manufacturer’s one-year limited warranty.