When should I use the tether strap?
Do not use the tether strap when the child restraint is in the rear-facing position. Always use the tether strap when installing in the forward-facing position with either Lower Anchor Connectors or vehicle seat belts. If your tether strap is too short to reach the vehicle's tether anchor, you will need a tether extender—call ParentLink at 1-800-233-5921 (U.S.) or 1-937-773-3971 (Canada). (Pages 9, 44, 49)
From the official Evenflo Symphony All In One Car Seat manual, page 9
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