Gembird 3D Printer Filament Dryer Box User Manual page 9

 Plug the Adapter into the AC100-240V ~50/60Hz power supply
and plug the output terminal into the interface in the tail of box.
 Press the button
to turn on, and enter the standby mode after
turning on, the LCD displays 0000
 Open the lid; put in the consumable tray; pull out the consumable
from the outlet.
 Press the
button once to enter the timing setting. Press the
button once to increase the time by 0.5 hours, and the total can be
set to 24 hours;Press the
stop the increase or decrease and set three seconds to start the
countdown; The LED display decreases by 0.1 hours as the unit
display.
 Press the
button to switch the Heat gear; 1-2-3 gear.Press the
button to adjust cyclically
button once to decrease by 0.5 hours,