The Uppababy Mesa Base features the SmartSecure system that takes the guesswork out of car seat fitting, the base has an electronic indicator panel that provides visual and audio confirmations of correct installation of the Mesa i-Size Car Seat. The Base also features a unique tension indicator that measures the positioning of the base to the vehicles seat. The single action ISOFIX release system enables the base to be quickly and easily removed and fitted to a vehicle. Features: Innovative SmartSecure System Quick installation with i-Size approved ISOFIX connectors Clear, interactive indicator with audio and Visual confirmations Pressure indicator on Load/Support leg