Britax Safe N Sound Compaq MKII Instructions For Installation & Use page 66

HOW TO INSTALL USING ISOFLEX
Attachment Clip
Car's upper anchorage point
DO NOT USE RESTRAINT IN REARWARD FACING MODE WITHOUT
STABILISING BAR FULLY EXTENDED.
THE TOP TETHER STRAP MUST ALWAYS BE FITTED WHEN THE
CHILD RESTRAINT IS USED IN A VEHICLE.
ALWAYS ATTACH THE HOOK AND REMOVE THE SLACK.
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Instructions for Installation & Use