Press and hold the device(switch) button for 2 seconds to start working. The LED pilot lamp turns on and turns on the unit to turn on by default. Then it will enter the kneading mode. Mode selection: Press the (switch) button to choose the corresponding working mode. There are 12 modes in total. Note: Take out the battery only when disposing this product, make sure the battery has run out of power before taking it out. Wear freely. The elastic U-shaped design of the ring neck curve prevents any discomfort even when worn for a long time, and does not slip off automatically, it can be charged by computers, power banks, etc. (The output voltage is 5V and current is less than 1.5A) The lamp flashes when charging. It takes about 3-5 hours to fully charge. After fully charged, the light is always on Skin-friendly Material: Made of high-quality organic silicone, ABS and stainless steel sheet. Lightweight, excellent usage, waterproof, and durable, skin-friendly, and comfortable to wear. Easy button operation is easy to operate. After selecting the work mode during use, press the button (highlight) to increase the strength of the button for a total of 20 levels (some models have 15 levels). (weak body): Choose the comfort strength you will receive by yourself to decrease the strength every time you press the button.