1. Press and hold the power button for 2 seconds to turn the machine on and off. 2. This product has a heating function, while massaging, it will heat the neck and promote blood circulation in the neck. 3. Short press the + key to increase the strength. There are 15 gears in total, set to one gear at startup. 4. Low frequency, relieve neck pain, convenient, light and portable, automatically shut down after 15 minutes of work 5. The product adopts telescopic strong arm technology, which has good resilienc