Backlight - Vlahova Rb3552 Handbuch

The main unit automatically starts receiving transmission from remote sensor for outdoor temperature after batteries
inserted.
 The remote sensor will automatically transmit temperature signal to the main unit after batteries inserted.
 If the main unit failed to receive transmission from remote sensor ("- -.-"display on the LCD), press and hold the "+"
button for 2 seconds to receive transmission manually. RF icon flashes on the LCD，the main unit will to receive the
remote sensor again.

Backlight

 Press the button
to active backlight for 8 seconds.