Wave Duo is ergonomically contoured to the back, spine, and neck. This portable smart vibrating roller features five powerful vibration frequencies and high-traction wave grooves that work to deliver just the right angles of pressure to areas in need. Release soreness, reduce tension, and improve movement in peace with noise dampening silicone. Youll have 200 minutes of battery life and if thats not enough, charge and continue. Use Bluetooth connectivity as needed.