BEST 40W Lead Free Mobile Phone Electric Soldering Iron (Voltage 220V)1. Power socket should be used with a reliable grounding device. And before using, should check the voltage specification. 2. For the first time used, the heating element maybe have some smoke which is normal phenomenon. After a few minites,the smoke willdisperse. 3. In the working state,forbid dismount electric partes and other parts. Please use natural Thermal Dissipated soldering support. 4. Soldering tip should be inserted into the bottom of the