The Kh-320 Fascial Gun Muscle Massager is a handheld percussion therapy device that delivers pulsating pressure into your tissue to relieve muscle soreness and stiffness. It can improve blood circulation and promote faster recovery after exercise. With multiple massage attachments, it targets different muscle groups for a customized massage experience. PRODUCT SPECIFICATIONS: Speed Levels: 06 Amplitude: Up to 12mm Battery Life: Up to 4 hours Noise Level: Less than 50dB