It's an extra safety attachment that hooks the seat either to the floor when rear-facing or to the back somewhere when forward facing. The Britax manual explains it and you have to check your car manual to see where to attach it properly.
CP 3/07 BFP 5/07 - Kylie born 2/08. BPF 2/09 - Alexandra born 10/09. TTC since 8/13 - diagnosed difficulty conceiving due to LP defect. Took vitamin B and Vitex Berry to help lengthen. BFP 2/14 - Missed M/C found at 8.5 weeks. D&C at 9w2d. Partial Molar Pregnancy. BFP 11/14
I tell everyone this, but convertible carseats are pretty intense to install the first time. Please make sure you get it inspected by a profesional before you start using it.
Mom to Harmon 1/17/08 and twins Rachel & Callum 8/28/09
Re: what is a tether
BFP 5/07 - Kylie born 2/08. BPF 2/09 - Alexandra born 10/09.
TTC since 8/13 - diagnosed difficulty conceiving due to LP defect. Took vitamin B and Vitex Berry to help lengthen.
BFP 2/14 - Missed M/C found at 8.5 weeks. D&C at 9w2d. Partial Molar Pregnancy.
BFP 11/14
My Pregnancy(ies) Blog