Unbelievably quiet: The QX150 motor, incorporating QuietForce Technology, delivers powerful deep muscle treatment comparable to professional-grade devices while maintaining a quiet operation similar to average massage devices.Battery life: Includes two rechargeable lithium-ion batteries, each offering 150 minutes of use. With the ability to charge one battery while using the other, you can enjoy uninterrupted sessions all day long. Customizable speed range and OLED screen: Monitor the current speed and force on the OLED screen and access any speed between 1750-2400 percussions per minute (PPMs) through the Therabody app for precise control.Ergonomic multi-grip: The device features a rotating arm and ergonomic multi-grip design, allowing you to hold it in various ways while reducing strain on your hands and arms.Smart app integration: Connect to the app via Bluetooth to access personalized wellness routines based on your preferences and behaviors, enhancing your overall massage experience.