You have to install the seat forward facing on the back seat of the car, with the seatbelt. This way you can use it up to 3 years of age or approximately 15-18 kgs. When your child grows, you can take the car seat’s harness out and use the car’s seatbelt instead. These seats are reclining so those kids who sleep a lot while traveling can also be comfortable. For maximum safety, it has a 5-point harness system and the height is adjustable.