WT 7400 - Manual
and 4 x AA size 1.5V alkaline batteries into the backlight battery compartment.
Pay attention to the polarity of the batteries
[ “+” and “ –“ marks] .
Rotate the time adjustment knob to set the current time on the clock.
Backlight function
Hold the backlight test button
(9)
to see the effect of the backlight.
Put the backlight brightness selector
switch
(8)
to the
OFF
position, there will
be no backlight function at night.
Put the backlight brightness selector
switch
(8)
to
position,
dimmed
backlight will be lit at night.
Put the backlight brightness selector
switch
(8)
to
position, more bright
backlight will be lit at night.
Precautions
This main unit is intended to be used only indoors.
Do not subject the unit to excessive force or shock.
Do not expose the unit to extreme temperatures, direct sunlight, dust or
humidity.
Do not immerse in water.
Avoid contact with any corrosive materials.
Do not dispose this unit in a fire as it may explode.
Do not open the inner back case or tamper with any components of this unit.
Batteries safety warnings
Use only alkaline batteries, not rechargeable batteries.
Install batteries correctly by matching the polarities (+/-).
Always replace a complete set of batteries.
Never mix used and new batteries.
Remove exhausted batteries immediately.
