1. Built in pressing feedback system can automatically adjust the motor speed and output power according to the massage pressing force, which is more smarter. 2. High frequency vibration relaxes the myofascial membrane, upgrades the intelligent chip, and provides a intelligent interactive experience. 3. Deeply massage the muscles, effectively reduce muscle soreness and stiffness, and relieve muscle fatigue. 4. Multi part and multifunctional massage machines can help you solve a variety of problems. 5. High speed noise reduction motor, stable high power, massage directly to the deep layer of the 16mm muscle. Specification: Item Type: Muscle Massager Power Supply Mode: Lithium battery Battery Capacity: 2000mAh (Included) 4 Massage Head Suitable Parts: Spherical Head: The force and thrust of the ball are uniform and soft, suitable for massage and relaxation of the waist, abdomen, buttocks, and legs. Flat Head: Suitable for large muscle groups, legs, buttocks, etc., deep stimulation U Shaped Head: Suitable for massaging the neck, spine and Achilles tendon Cylindrical Head: Suitable for meridians, soles of feet, palms, Achilles tendons and back rhomboid muscles Applicable Symptoms: Neck Shoulder Pain at Work: Relieve long term sedentary, shoulder and neck pain Exhausted after Housework: Relaxation after exhausted housework Back Pain in the Elderly: Relieve the back pain in the elderly Warm up before Exercise: Let the muscles warm up and full of vitality Injuries in Sports: Recovery of muscle sports injuries Fatigue after Exercise: Relieve muscle fatigue after exercise Function: 1. Pain and spasm caused by muscle contusion, sprain and strain 2. Help the edema in the swollen area 3. Relaxed thickened connective tissue and fascia 4. Reduce the accumulation of lactic acid in muscles 5. Increase the flexibility of joints 6. Eliminate muscle fatigue Taboo: 1. Aneurysm, bleeding, use of blood . 2. Heart disease with a pacemaker or defibrillator, pregnancy, cancer. 3. The internal fixation shall not be used within 3 inches of the joint within 90 days. 4. Sensitive parts: head, face, cervical , spine . 5. Close to the bone of the muscle coverage position: humerus.Instep, hand, etc. Package List: 1 x Muscle Massager 4 x Massage Head 1 x English Manual 1 x USB Cable