This extra base that's compatible with your Doona Infant Car Seat (sold separately) is ideal for a second car or a grandparents' vehicle. Intended for rear-facing use only, it can be installed in a vehicle either with the LATCH system or with the vehicle's belt. Compatible with Doona Infant Car Seat (sold separately) One-click vehicle installation Height adjustment mechanism and easy-to-read level indicators ensure proper seat angle adjustment and positioning Plastic/metal Imported Kids' Wear