For attachment on chassis handle.  Compatible with Stokke® Xplory® chassis with serial number 331324 and higher and with all Stokke® Crusi™, Stokke® Trailz™ and Stokke® Scoot™ chassis. For Stokke® Xplory® from serial number 127390 to 331323 an adaptor is necessary and can be purchased.