The BeSafe iZi Modular i-Size ISOFIX Base is the backbone of the new i-Size Modular system. The BeSafe iZi Modular i-Size Base can be used for both iZi Go Modular & iZi Modular i-Size car seats. The base allows you to use two separate car seats that are designed for the height of a child (approximately 0 to 12 months and 6 months to 4 years respectively) to give your child tailored safety and support compared to seats that cover a wider and more generic weight/age range. Simple to install, the base clicks onto your vehicle's ISOfix anchor points, then you lower the support leg for extra stability. Green indicators ensure you've installed it properly and safely, then it's just as easy to click either the infant carrier or car seat onto the base!