This is the Field Link Portable Programmer Air Card from Castle Creations.FEATURES: Programs Castle air controllers without a computer Works as a complete USB Castle Link with your computer Works with all Castle Link compatible air productsINCLUDES: One Field Link Portable Programmer Card for flying One USB cableREQUIRES: Windows PC Castle Link Software (available at www.castlecreations.com)SPECS: Length: 55mm (2.2") Width: 85mm (3.3") Thickness: 5mm (0.20")COMMENTS: Will only work with Castle controller firmware released after 2007 cnh 1/27/10 ir/jxs