Handheld Percussion Massage Device Featuring QuietGlideTM Technology, Customized for You – Featuring three speeds of rapid percussion that can be changed with a single button to whatever speed you need, Do Not Disturb – Thanks to our patented QuietGlideTM technology the Hypervolt provides relief almost silently, Patented Pressure – Discover pressure preferences with the Hypervolt’s patented pressure sensor (3 levels). TECH FEATURES -Bluetooth® connected to the Hyperice App (automated speed control), Brushless high-torque 60 W motor, 3 speeds – up to 3200 percussions per minute, 24 V rechargeable lithium-ion battery (2.5+ hrs of use per charge), Lightweight, easy to use (2.5 lbs), TSA approved for carry-on.