1. TENS+EMS double pulse technology, deeply massage the muscles, relax the cervical spine, relieve neck fatigue, and effectively improve neck problems such as shoulder and neck strain, pain, soreness, stiffness and discomfort. 2. Three-level constant temperature hot compress (42/47/52) can effectively promote blood circulation, unclog blood vessels, relieve neck pain, and relieve cervical spine pressure. 3. 4 massage modes, 9 adjustable intensity, you can freely adjust according to your personal tolerance and preferences. 4. Small and light body, pendant-style innovative design, comfortable to wear, easy to carry, enjoy comfortable massage anytime, anywhere. 5. The ergonomically designed electrode pads conform 270 to the curves of parts of the body, such as legs, arms, shoulders and neck. Weight: 0.22kg Rated voltage (V): 5v/1A Net state current: below 1uA Rated power (W): 5W Battery capacity: 550Ah Color: Gray & Black Material: Plastic+Metal Package Contents: 1 * Neck Massager Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.