Specifications: Item Name:Vibration Therapy Massage Ball Material: ABS and Silicone, safe to body Size: 96 CM Diameter Product Operation: USB charging Battery: DC3.7v, 2400mAh Feature: Recharger, waterproof, tasteless safety silicone, Fuction: Muscle relaxation, relieve sore pain , relieve fatigue Mode: 4 Speed Waterproof: 100 percent waterproof Vibration frequency: 2000-6000Rpm Applications: Gym, YOga, Home use for sport life Charging time: 2-3 Hours Motor Temperature: 65°C Working time(Max speed Time): 60 mins(6 cycle)10 mins per cycle Feature [Improved Vibrating Design]- -Great revolution for Vibrating Massage Ball, newest Vibrating design specially function on small muscle groups. High intensity vibration helps penetrate deep into muscles, effective for releasing plantar fasciitis, tensions, myofascial release and trigger point treatment. [4 Vibration Levels with Pulsating Mode]- - Enhance your Pre-workout and Recovery system with 4 vibration pulsating modes, Low/Medium/Pulsating/High Vibration Modes for your option, Electric Massage Ball ideal for warming up, circulation improvement and recovery of sore and tight muscles. [Rechargeable and Portable]- -This massage ball is lightweight, easy to put in a small storage bag(included in the package). Easy and quick charge with USB cable, convenient to use anytime and anywhere for relieving your back, hips, legs, arms, waist, and feet. [Beat Soreness and Relax]- -Ideal rechargeable roller for muscle tension and workout soreness with special designed textured surfaces, Massage Balls Physical Therapy effective as a powerful tool in the massage.