Gembird 3D Printer Filament Dryer Box User Manual page 7

Four Buttons
 The product has four buttons, the open button
the function button
 Press
to switch modes and the
parameters
 The system will be in dormancy after no-operation for 5 seconds,
the backlight disappears in dormant state, press any button to
wake up, and then press button to set parameters or shut down
 Operation setting timing; please refer to the fan position
( illustration of items 1-5 in the previous method of use)
the up button the down button
to change the