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