Ultra-long runtime: 6 batteries, each with a capacity of 2600mAh, keep the device running for 4h on a full charge and up to 10h in standby; auto shutoff after 15 minutes of continuous use to protect against overheating. 10 Adjustable Speeds: 24W powerful torque motor delivers 1400 to 3200 strokes per minute to reach up to 12mm deep tissue and promote blood circulation for effective muscle relaxation after exercise. 6 Special Massage Attachments: Interchangeable attachments in 6 shapes designed for specific muscle groups for faster recovery; easily and quickly replaceable in seconds. Quiet Operation: 24V brushless motor and high quality bearing provide near whisper-quiet massage operation for use in the office or gym without disturbing others. Convenient Travel Case: Comes with a PU travel case to keep all parts neat and easy to store.