electric vibrating massage ball, 4-speed high-intensity fitness yoga massage roller, relieving muscle tension pain & pressure massagers, rechargeable & washable neck/back/waist/foot etc body massager tuofang combats&reduces muscle pain choose from four vibration levels to match your needs lightweight, compact&built with high-quality material apply pressure&vibration exactly where you need it electric massage ball meet convenience this roller has a built-in electric massage motor and battery. no fiddling. just plug it in with the included cable to charge. this mobility and convenience will make it you are go-to roller for the gym, track, court, or living room. easy to use simply plug in to charge. one full charge typically lasts about 90 minutes of vibration. safety auto-shutoff after 12 minutes. press the power button to activate the vibration feature. press repeatedly to cycle through the vibration options: low, medium, high and wave. specification weight: 0.36kg maximum load: 176.37/80kg ac adapter:110v~240v 50/60hz battery capacity: 2500mah charging time:90 minutes input: 9v ia auto timer: 12 minutes motor operating temperature: 65 degrees 4 modes: light, medium, high and variable speed vibration.