The One2 V2 Second Seat gives you the freedom to convert your stroller from single to tandem. Designed to accommodate a newborn or infant up to 15kg The travel system compatible frame is designed to connect to a Britax Safe-n-Sound Unity baby capsule (requires adaptors - sold separately). The one hand recline allows a near flat recline suitable for newborns and naps on the go for your little ones, with multiple configurations to suit your lifestyle. Compatible with Steelcraft One2 V2 strollers.