Specifications: Material: ABS Color: silver Weight: 0.22kg Packing size: 19.2*14*4cm Rated voltage (V): 5v\/1A Net state current: below 1uA Rated power (W): 5W Battery capacity: 550Ah Packing List: 1* Neck Massager 1* USB Charging Cable 1* English User Manual Features: 1. TENS+EMS double pulse technology, deeply massage the muscles, relax the cervical spine, relieve neck fatigue, and effectively improve various 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 various parts of the body, such as legs, arms, shoulders and neck.