FORD 2006 Explorer v.2 - Manual (Page 18)

Turn signal warning chime: Sounds when the turn signal lever has
been activated to signal a turn and not turned off after the vehicle is
driven more than 2 miles (3.2 km).
Parking brake ON warning chime: Sounds when the parking brake is
set, the engine is running and the vehicle is driven more than 3 mph (5
km).
Message center activation chime: Sounds when the following
warnings DOOR AJAR, LOW FUEL LEVEL or LOW TIRE PRESSURE
appear in the message center display for the first time.
GAUGES
Speedometer: Indicates the
current vehicle speed.
2006 Explorer (exp)
Owners Guide (post-2002-fmt)
USA (fus)
Instrument Cluster
18