The Nuna ARRA Isofix i-Size Base is suitable to use in another vehicle to fit your Nuna ARRA car seat without having swap over isofix bases from car to car. Features: Steel stability leg with crumple zone ISOFIX & coloured installation indicators Additional installation indicator Recommended use: Up to 13 kg. Use alongside ARRA Lay Flat i-Size Car Seat i-Size R129 Tested