Ayce TRUE BALCK 1.0 Manuel D'utilisation page 140

Note:
When the temperature is below -40°C or above 70°C,
"Lo" or "Hi" will be displayed respectively.
Humidity range below 1% or above 99%, "Lo" or "Hi"
will be displayed respectively.
No temperature / humidity level when the reading is
out of temperature / humidity display range.
COLOURFUL BACKLIGHT DISPLAY
Slide [ OFF / LO / HI ] slide switch to [ OFF ] position
to turn off the backlight (pressing [ ALARM / SNOOZE ]
key to turn on the backlight for 5 seconds). Slide to
[ LO ] position for the dimmer backlight. Slide to [ HI ]
position for the brighter backlight.
When the backlight is on, press [ ] color loop key to
turn on/off auto-color looping function at humidity
section.
When the backlight is on, press [ ] color loop key to
turn on/off auto-color looping function at temperature
section.
Press [
humidity mode and change backlight color according
to temperature & humidity readings on the display.
It has 13 backlight colours to display different
temperature ranges and 7 colours to display different
humidity ranges.
] key to activate colour by temperature &
GB