Join the car seat revolution, when you have the Evenflo Revolve360 Extend three-in-one convertible high-back booster car seat. Just like the best-selling Revolve360, this convertible car seat features single-handed 360-degree rotation, so you can easily get your kiddo in and out of their seat. SensorSafe technology alerts you to unsafe conditions, such as a chest clip unbuckling, through your phone.