CYBEX SOLUTION M-FIX Owner's Manual page 16

VEHICLE SEAT LOCATION REQUIREMENTS
The vehicle headrest MUST NOT interfere with the
booster seat Headrest.
If the vehicle headrest interferes with the installation of
this booster seat, adjust or remove the vehicle headrest.
Check your vehicle Owner's Manual
information.
NEVER USE this booster seat with the Backrest
reclined past the allowable adjustment range. An
audible CLICK will alert you when you have gone
too far.
The Backrest MUST REST against the vehicle seat back.
The Backrest will adjust to the vehicle seat back through an
allowable adjustment range of approximately 15° as shown
in green.
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