Its curved, ergonomic design is specifically built to help users reach difficult spots like the mid-back and neck on their own. Ergonomic Extension Handle: A 120-degree curved shape allows for self-massage of the entire body without needing assistance.Targeted Relief: Utilizes percussion and high-frequency vibration to relieve muscle stiffness, soreness, and improve circulation.Customizable Settings: Most models feature multiple speed intensity levels (typically 5 or 6) and 4–6 interchangeable massage heads for different muscle groups.Rechargeable: Includes a built-in battery (often 1500mAh) that provides 1–5 hours of use after a full charge.