Cervical Vibration Neck Protector Shoulder and Neck Heating Size: 21*16*4cm describe: 2 massage heads provide and comfortable massage. Tightly cover the muscles around the cervical spine and the painful parts of the whole body. Immediately release the neck tension in front of the computer or smartphone, effectively massage for countless hours. Relieve headaches, long-term fatigue and neck muscle relaxation. Humanized design, adapt to the neck of the human body. Enjoy relaxing massage anytime, anywhere, wireless hanging neck, light weight, easy to carry, suitable for home, office, business trips and other. new Product usage details: 1 Press and hold the power button for 2 seconds to turn the machine on and off 3. Short press the + button to increase the. There are 15 gears in total, and the setting is the first gear at startup. 4. Low-frequency, relieve neck pain, and convenient, light and portable, automatic power off 5. The product adopts telescopic strong arm technology, with good resilience and strong toughness. This product is button battery type (button battery model 2032)