1. Install the tip and tighten it ;
2. Long press to turn on/off the device;
3. Choose a working mode;
4. The equipment preset 10 minutes automatic shutdown function to prevent overheating;
5. You need to unplug the charging cable before turn it on and use;
6. The device works when it touches a tough thing like teeth and metal, if you use it on the skin or other soft thing, it will not work.