The UPPAbaby Mesa / Mesa?V2 Extra Base offers a convenient solution for multi-vehicle households, eliminating the need to transfer the base between cars. Featuring the SmartSecure installation system, it includes auto-retracting LATCH connectors, intuitive red-to-green tightness indicators, dual bubble-level indicators on both sides, and a built-in belt lock-off for secure seat-belt installations. The adjustable foot supports proper leveling across varied seat angles, and its low-profile, smooth-bottom design protects vehicle interiors and ensures compact storage. Note: This base is not compatible with the Mesa?Max or Aria car seats.