Chery A1 2008 Operating Instructions Manual page 55

INTRODUCTION OF FUNCTIONS AND DESCRIPTION OF INDICATIONS OF THE VEHICLE
motorcycle engine, brake air sound
etc. adjacent to the radar probe.

Driving in the jelly-shaped snow or
rain
Not give off alarm sound to
objects without the sensing range.
When there are several obstacles, the
probe of the reversing radar only
reports the closest one. When the
vehicle is moving, note that the probe
of the reversing radar at the other side
may approach to other obstacles.

In consideration of the form of
obstacle, the radar may not give off
alarm sound to the objects difficult
to reflect the ultrasonic, shown in the
following figure.
Stud
Corrugated paper Bicycle tire
Foot stone
Thin tree
Angle
section