These photos are of the Doona car seat / pushchair.
The Doona is fundamentally a car seat with integrated, drop down wheels. Thus it is simple to remove the Doona seat from the car, drop the wheels and push it away like a stroller.
The Doona has passed safety testing both as a 0+ car seat, and also as a suitable from birth pushchair.
Please read our full review here for further details and information on the Doona pushchair.