Bluetooth. Powerful. Quiet. Benefits: Helps relieve soreness and stiffness. Accelerates warm up and recovery before and after physical activity. Promotes circulation. Tech Features: Brushless high-torque 60 W motor. Patented Quiet Glide technology. 3 speed settings (30Hz / 40Hz / 53Hz). 5 interchangeable head attachments. 24 V rechargeable head attachments. Patented pressure sensor. Lightweight, easy to use. What's In The Box: Hypervolt. AC/DC wall charger. Head attachment pouch. Head attachment (5). CE listed. FCC listed. Designed by Hyperice in California. Made in China.