The Baby Jogger Rapidlock infant car seat base with belt-tensioning technology allows for easy and safe car seat installation for baby's next adventure. It's the most convenient way to use your infant car seat in multiple vehicles and is compatible with the Baby Jogger city Go, city Go 2, and city Go Air infant car seats. This base also features an integrated SecureStop rebound resistant bar for an added layer of safety. With 4 different recline positions, this base can fit securely into any vehicle. Utilize the dual bubble level indicators to ensure the base is properly installed in seconds using either the vehicle seat belt or push-button Latch. True Test Plus safety standards provide additional peace of mind that baby will be protected.