1. Insert the soldering iron tip to the bottom hear a sound indicating the completion of this step. 2. Long to turn on automatically 3. once to switch temperature Please note; the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Note: For transportation safety, rosin flux is not included The 3 temperature levels are a temperature range. They are not very accurate and have errors. Voltage 5V, power 8W Color: Black Material: Aluminum alloy Package Contents: 1x soldering iron 1x soldering iron head 1x Stand 1x tin wire (color random,don't accept the specified color) 1x usb cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.