YIHUA 8509 Micro Hot Air Gun Soldering Station with 3.5/3/2.5/2 mm Nozzle Temperature Adjustable SMD Rework Station Welding Tools. Feature: 1: Unique micro nozzles: 4 mm nozzles ,3.5 mm nozzle, 3 mm nozzle, 2.5 mm nozzle, 2 mm nozzle, 1.5 mm nozzle 2: Low noise design: When in max air volume, the noise from detector is less than 60 DB, similar to normal indoor conversation sound. 3: Automatically cool-down function: In automatic mode, temperature will cool down to 100 when hot air handle is put in the holder because holder is equipped with an automatic sensor. When in manual mode,this automatic function will be stopped. 4: Rotatable display screen.It is convenient to adjust the display screen position via slight press 5. and conversion function. 6. Temperature correction function. 7.Air gun auto. And manual conversion function Please remove the screw at the bottom before use