Features: 1.FAST HEATING AND COOLING: This mini soldering iron adopts 5V DC power supply and using the special internal heat type soldering soldering head, heat fast and concentration. Heating up in less than 15 seconds, Cooling down in less than 35 seconds, which can greatly improve your work efficiency. 2.SAFE AUTO-SLEEP FUNCTION : When it is not working for more than 25 seconds, the indicator light will turn off and enter standby mode automatically. This function can better prolong the service life of welding head and save power, and it is safer. 3.HOW TO USE : The power button has a reminder light. Press the power button, the indicator light is on.The voltage knob can be adjusted in both directions, and the temperature of the soldering iron can be adjusted. There is an adjustment voltage knob at the bottom, and the adjustable range is 3.3V-4.8V. 4.PORTABLE AND CONVENIENT: This usb soldering iron is small and lightweight, it is convenient to put in your tool bag and take to your working place. USB cable, which can be powered by computer, mobile power supply or your mobile phone charger and so on. specification:Convenient to operate, wireless design, safe to use, resonable size, suitable for both home use and take out. Two-way adjustment of the voltage knob, the temperature of the solde iron can be adjusted. There is a knob at the bottom to adjust the voltage, The adjustable range is 3.3V-4.8V. Solde iron interface, can be connected with a solde iron and a ging. Copper alloy solde iron, fast heat transfer, rapid temperature rise. The power button has a prompt light, press the power button, the indicator light is on. Use the button light flashes indicates the battery low. : Material: Alloy Main Color: Silver/Black/Blue/Red Size: About 4*15*25cm Powered by: Rechargeable Battery(t-in) PackageList:Solde iron*1Solde iron tip*1Solde iron stand*1Charging cable*1 NoteDue to the lighting effects and shooting angles, there is color difference in the product, please understand.Due to manual measurement, there is a tolerance in the product size.