Valco Baby Spark Duo Stroller The Valco Baby Spark Duo Stroller is the first of its kind to offer two reversible '3 in 1' seats that convert from luxurious bassinets to rear or forward facing seats. The stroller adapts to your growing children's diverse needs; whether its twins transitioning their way from infant bassinets in tandem or siblings accommodating personal preferences. With an easy fold with or without the seat attached and tons of storage space, the Spark Duo Stroller is truly brilliant, any way you switch it.