Base i-Size is the safest way to attach the Primo Viaggio i-Size car seat (available separately) in the car. Approved according to the ECE R 129 standard, it is easily fixed to the Isofix hooks of the car without using a seat belt. Features: Compatible with Primo Viaggio i-Size car seat (available separately) Maximum protection and ease of use Blind lock system - prevents the car seat from being accidentally released by another passenger Red/Green indicators state when the seat is correctly attached to the base Load leg is adjustable into 12 different positions Red/Green indicators, located on either side and on top of the base, state when Isofix connectors are correctly fastened to the vehicle seat