4D Shiatsu Neck & Back Massager Experience professional-level massage with this Neck & Shoulder Massager. The upper massage head mimics the natural curve of a hand to fully support the cervical spine, while the lower head applies thumb-like pressure. Combining palm press, kneading, lifting, acupressure, and pinching techniques, it effectively relieves neck tension, shoulder stiffness, and back discomfort, offering deep relaxation every day.  Soothing heat & dual-zone technology: Our neck and shoulder massager features 2 adjustable heating levels that simulate real-hand warmth. The dual-zone system adheres closely to the skin to prevent cold spots. Usage Tip: The heat is designed to be soothing and subtle for safety; please allow 3-5 minutes of continuous use to reach the optimal warmth.  Cordless design & ergonomic upstanding use: Enjoy up to 90 minutes of cordless relaxation on a single charge. The space-compression technology ensures powerful performance in a compact frame. IMPORTANT: To protect the internal 4D mechanism, this device is designed for sitting or standing use only. Avoid laying your full body weight on the massager against a bed or sofa.  Fixed-width design & wearing options: Features 2 versatile wearing options: handheld for precision or strap-on for hands-free use. The ergonomic "physiological arc" is engineered for a snug, high-pressure fit. Size Check: The massage heads have a fixed width for maximum kneading force. Designed for a snug, firm fit. Users with a neck circumference over 16 inches may experience a tighter feel.  Premium gift choice & maintenance: An ideal wellness gift for office workers and seniors seeking muscle flexibility. For best performance, please use a standard 5V/2A adapter for charging. Each massager undergoes strict quality inspection. If you experience any issues, our responsive support team is ready to assist you with a solution.