Handheld Percussion Massage Device Featuring QuietGlideTM Technology. Hours of Power – 30% more power than the original Hypervolt backed by a brushless high-torque 90 W motor, Whisper-Quiet – Our patented QuietGlideTM technology provides relief at a whisper so you can use it anytime, anywhere without interuption, Sensor Technology – Patented pressure sensor with three levels, giving you a digital indication of how much pressure you’re applying. TECH FEATURES – Bluetooth® connected to the Hyperice App (automated speed control), 3 speeds – up to 3200 percussions per minute 24 V rechargeable lithium-ion battery (2+ hrs of use per charge), Lightweight, easy to use (3 lbs), TSA approved for carry-on.