With the Hyperice Vyper 2.0 foam roller you promote flexibility or the recovery of your muscles. You use it for a warm up, to loosen muscles or to promote your muscle recovery. This makes it suitable for your back, hip or legs. The device has 3 positions with vibrations that vary in intensity. Because of the vibrations, the massages are deeper, which activates your muscles better. This makes the Vyper 2.0 more effective than a standard foam roller. Thanks to the built-in battery you only have to charge the roller before you use it. Fully charged, use it for about 2 hours.