Copper Gym Massage Gun is USB and battery operated, whisper quiet, ultra-lightweight and super portable. Professional level Copper Gym Massage Gun:Helps relieve muscle soreness and stiffness. Improves range of motion Accelerates warmup and recovery. Lightweight and easy-to-use for self myofascial release. Copper Gym Massage Gun is known to offer protections from bacteria it also may include skin benefits may help increase circulation You get a Touch of Copper with each Copper Gym Massage head to warm up your muscles prior to your workout to help reduce injury. The copper is positioned directly over the source of the stiffness or pain.