This Portable Cordless Massage Roller Combines a High-density Foam Core with a Soft, Sweat-resistant Silicon Surface for Durability & Easy Cleaning. Its Deep-tissue Vibration Penetrates Muscle Layers to Relieve Soreness, Improve Blood Flow, & Speed Recovery After Exercise or Long Hours of Sitting. Equipped with a Remote Controller, You Can Adjust Three Intensity Levels & Two Massage Modes Without Bendy Down. the Rechargeable Battery Offers Up to Three Hours of Continuous Use on a Full Charge. Ideal for Legs, Back, Shoulders, & Neck, This Cordless Design Works at Home, Office, or Gym. the Seamless Molding Process Ensures a Waterproof, Noise-free Operation. Use It Before Workouts to Warm Up Muscles or After Training to Reduce Stiffness.