Description: Unscrew the soldering iron tip (correct density), press the button 5 times within 2 seconds to turn on. Press and hold the button to heat up. Release to stop working. Press and hold the button for more than 1 minute. The battery will activate the timeout protection function. The light flashes. At this point, just release the button and continue to hold it down. Need to close and press 5 times in a row. The resistance of the soldering iron tip is 1.5 ohms at 15W and not 8W at 2.8 ohms. The lower the resistance, the greater the power. The threaded interface is a 510 interface, M7x0.5mm thread. Specification: Material: Stainless Steel Interface: 510 Size Chart: 16cm/6.30inch Package Includes: 1 Piece Electric Soldering Iron Kit Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!