Solder station are add new feature for manual and auto transform. x put the key to auto: when you put the gun on the holder over 2 minute, that the gun will enter into standby mode. x put the key to manual: when you put the gun on the holder, that the gun still work along main function. 850Ad hot air smd rework station chip used Samsung microcomputer control, warming up quickly. Safe solder qfp, plcc, bga and other temperature sensitive components. Adjust the air flow and temperature control rotation. Refer to the instructions included with three kinds of nozzles (big, medium and small) replacement part. Would replace the part if the resistance value is incorrect. When the temperature is less than 80oc, can stop rotation automatically. Intelligent detection. Green lines and high quality silicone body heat good for extend life and save power. Comfortable portable handheld and the digital LED display.