When the display is not lit up, press any of the keys around it to reactivate the back-lighting; when it is already lit up, press a key to navigate the menus and activate automatic switch-off after 60 seconds. If the display switches off (standby), press the up and down arrows for 5 seconds to reactivate it; the image will appear again on the LCD display.

The image of the display and function buttons:

You can find the image of the display and function buttons on the following link: https://file.parklio.co/file/hvymv2553648ad58e44d89f3824c3bd5f1118

WARNING: avoid disconnecting and reconnecting the power supply, as this will cause the battery charge status information to be lost (and only recovered at the end of a complete charging cycle).