This is the Field Link Portable Programmer Car Card from Castle Creations. FEATURES Programs Castle car controllers without a computer Works as a complete USB Castle Link with your computer Works with all Castle Link compatible car products INCLUDES One Field Link Portable Programmer Card One USB cable REQUIREMENTS Windows PC Castle Link Software (available at www.castlecreations.com) SPECIFICATIONS Length: 55mm (2.2") Width: 85mm (3.3") Thickness: 5mm (0.20") COMMENTS Will only work with Castle controller firmware released after 2007