1、Rechargeable Cordless Soldering Iron: 5V 15W battery powered soldering iron with built in 1100mAh battery. To charge the cordless soldering iron, please connect the USB port to a computer, power bank or cell phone charger. One charge takes about 2 hours and works continuously for 40 minutes. 2、Adjusting Voltage: The knob on the bottom of the soldering iron adjusts the voltage in both directions from 3.3V to 4.8V and generates heat up to 842℉ or 450℃. Press and hold the on or off button for 8 seconds for fast heating, then repeat this operation to continue heating. 3、510 Threaded Interface: The soldering iron pen is made of stainless steel and the 510 threaded interface allows for the connection of a copper alloy soldering iron tip and a USB soldering iron charging cable. 4、Safety Protection: Press the switch button 5 times continuously within 2 seconds to turn it on and the indicator lights up. Automatically enter sleep mode within 10 seconds without any operation. 5、Portable Soldering Iron: Wireless rechargeable soldering tool is light weight and easy to carry, suitable for DIY design, electronic products soldering, jewelry repair, electrical parts, circuit board repair, etc.