With surprising power and whisper-quiet operation, the Hyperice Hypervolt Go Arm, Legs Massager was designed with simplicity in mind. It is ultra-lightweight at 1.5 pounds and 30% smaller than the Hypervolt, the GO is ready to provide relief wherever you roam. Its small build and lightweight design allow for more versatility in how it's held and operated. Cycle through three speeds of rapid percussion without lifting a finger. The Hyperice Hypervolt Go Arm, Legs Massager comes with brushless high-torque 40 watts motor that ensures durable performance. The 18 Volt rechargeable lithium-ion battery gives long-lasting performance.