The TriggerPoint(R) Charge Vibe Plus Massager is a vibrating foam roller, featuring a cordless, rechargeable exterior and includes four vibration frequencies that are ideal for pain relief and muscle relaxation. Product Features Patented multi-density GRID surface channels blood and oxygen through the muscle to increase circulation and accelerate muscle recovery Small 3.5 inch diameter provides less surface area while rolling delivering targeted relief to deep layers of tissue Recommended roller to prepare the body for peak performance by helping users relieve muscle pain and tightness before physical activity Additional Details Measures 12 x 3.5 inches and weighs 2.5 pounds Rechargeable battery can last up to two hours AC charger included Backed by one-year limited warranty