Deepace KC908 Manual page 22

There is no need to use a film screen protector. While cleaning the screen,
first step is to wipe the sands off the glass, then use cleaning paper to wipe
the screen. Avoid using alkaline detergent. If the screen is broken, user needs
to send KC908 to our factory to repair.
2.3.2 Keyboard
The keyboard has three areas, F1 to F5 are the soft key to operate the soft
menu, and the function buttons are used to set and adjust the functions. The
number buttons are used to input the value.