Denver E-3400RM Manuel De L'utilisateur page 21

Speed mode switch& Mileage mode switch
U represents unit settings, "1" is mile, and "2" is kilometer. The default value is "2".
To toggle the unit, press the UP/DOWN button until the desired unit is displayed.
To store a changed setting, press the ON/OFF button and access trip distance clearance settings again
or hold the ON/OFF button for 2s to exit General Settings.
Backlight On/Off
To switch on E-bike front light or rear light, press the "UP" button for 2s. The display backlight
brightness is automatically reduced while the screen displays.
Likewise, press the "UP" button for 2s again, the bike front light and rear light can be switched off
and display backlight recover its brightness.
*If E-bike front light or rear light is independent of "UP" button, the "UP" button can only be used
to switch on/off the display backlight.
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