Chal-tec Nels Pro Manuel D'utilisation page 31

Before using ISOFIX and TT straps, check whether the car seat is equipped
with ISOFIX fixed anchor points and whether the size category matches. The
car seat isequipped with ISOFIX fixed anchor points and ISOFIX size category
match before using.
Top tether
Vehcile up
anchor point
First read the car instructions and check whether the car seat is equipped
with ISOFIX fixed anchor points and their recommended ISOFIX constraints
System match or ISOFIX size and type or not.
J
ISOFIX Vehcile
below anchor
point
EN
31