MUSCLE SORENESS RELIEVES: Helps for relieves tight muscles, soreness, and stiff backs. Great for personal use as well as being one of the best massage devices for professional users, perfect for a physical therapist or chiropractorCORDLESS & RECHARGEABLE: 2500mAh high-quality rechargeable lithium battery, ensures a 6 hours working time(low speed), takes 1.5-2 hours to be fully charged. 4.1lbs only, you can use it at home, gym, office, etcPOWERFUL MOTOR & SAFETY: 24V brushless motor and quite glide noise reduction technology that brings high power but low noise (35dB - 55dB) experience. 20 Adjustable Speeds meet all your need. Ideal for athletes, people who work out or people with injuries