Mitsubishi ECLIPSE Owner's Manual page 153

Features and controls
To reduce the glare
Type 1, 2
The day/night knob (A) at the bottom of the mirror can be used
to adjust the mirror to reduce the glare from the headlights of
vehicles behind you during night driving.
3
1- Daytime position
2- Night position
3-58
Type 3, 4
When the headlights of the vehicles behind you are very bright,
the reflection factor of the rearview mirror is automatically
changed to reduce the glare.
Type 3
Type 4
Normally, use the automatic mode. When the switch (1) is
pressed, the indicator (2) illuminates and the reflection factor
of the mirror is automatically changed.
NOTE
Do not hang items on, or spray glass cleaner on the sensor
(3), as reduced sensitivity could result.