After you turn off the heat gun with the switch, the fan will run for another 10 seconds to cool down, and the power will be cut off automatically after 10 seconds. This is the function of the 10S delayed shutdown feature, which helps to improve safety and prolong the service life of the heat gun Compact Design Powerful SEEKONE heat gun is 20% smaller than traditional heat guns on the market, easy to carry and store.1800W heat gun is lightweight but powerful, with precise temperature control from 122? - 1202? and two-speed airflow control: I: 50-300?, 300L/min; II: 50-650?, 500L/min 10S Shutdown Delay Function This upgraded heat gun features a 10-second delay shutdown design that allows the heating wire to cool down after shutdown to increase the safety and extend the life of the unit. The built-in overheat protection will block the heating element in the event of overheating to prevent combustion More Info in Pictures BRAND NEW