RENPHO Electric Percussion Massager has a built-in battery which means that it can be used anywhere. Relaxing massage anytime, anywhere! A quick massage will help you to physically relax your body, increase joint flexibility. A good massage has been proved to have positive effects on the human body by reducing stress, discomfort, and muscle tension. Cordless handheld massager High battery capacity Long-serving time--up to 140 mins Great motor--up to 3600 Rpm Percussion technical Weight: 1.8lbs Bundle items for a great discount.