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.