The knox's smart Secure system features an indicator window that turns from red to green when the seat is correctly installed. A multi-directional tether and the knox's energy response technology provide unparalleled safety and performance. The KNOX is the first child restraint to include koroyd technology designed to absorb the maximum amount of energy from an impact. Approximately: 1-6 years infant insert: 14-25 lbs. Rear-facing: 14-45 lbs. Forward-facing: 25-65 lbs. Height: up to 49" Fmvss 213 Max weight of child (lb) 65 min/Max weight of child 14-65 lbs. Seat height lowest position: - Seat bight to inner edge (highest point) of harness slot is 10" - Seat bight to top of headrest is 19" Seated height in highest position: - Seat bight to inner edge (highest point) of harness slot is 17.5" - Seat bight to top of headrest is 26"