Britax Roundabout 55 Guide D'utilisation page 12

Vehicle Compatibility
4.
ELR (Emergency Locking Retractor) with a Sliding Latch Plate
Has a latch plate that freely
a
slides along the vehicle
seat belt webbing.
Has a retractor that locks
b
only in an emergency
situation such as sudden
stop or crash.
IMPORTANT: This belt type requires
the use of the lock-offs built into the
seat for rear- and forward-facing
installations. See page 21 for information on using the lock-offs.
Lap Belt
5.
ALR (Automatic Locking Retractor)
Has a latch plate that is
a
sewn into the webbing.
Has a retractor that stops the
b
belt from being pulled out
again once the belt webbing
has been pulled out at least
61 cm (24 in. ).
10
Latch
plate