Pathfinder inSTEP Tandem Bike Trailer.

I found the same bike on Amazon, here’s their description: If your little one wants to come along for the ride but isn't ready to bike alone, this Pathfinder is the perfect solution. The Pathfinder has an adjustable child-size seat plus handlebars and pedals. Kids have the fun of riding a real bike, while parents maintain total control. The frame easily attaches to a full-size adult bike (mounting hardware included) and has a 20" spoked wheel with full ball bearings and a pneumatic tube tire. Includes a safety flag, side and rear reflector, safety chain guard, and hardware to attach to bike. Folds easily into trunks. Recommended for ages 4 to 9, up to 75lbs. Imported. 26Hx63L".