The City GO Car Seat ISOFIX Base is the perfect partner for the Baby Jogger City GO infant car seat so your baby can travel safely and securely in a rear-facing position. Install using a car?s ISOFIX anchor points which will ensure your car seat is installed correctly every trip. Simply use the click in and out system and handy indicators to show the correct fitting. The arm indicators that show green when the car seat base has been securely fitted and red when not. The extendable support leg also has a red/green installation indicator that securely fits against the floor for stability, preventing tilting or tipping in the event of a collision. Read more… The car seat can be released from the base with one hand, leaving your other hand free to lift the infant carrier by its handle.