This is the field link portable programmer air card from Castle Creations.
Includes: One Field Link Portable Programmer Card for flying and USB cable
Requires: Windows PC and Castle Link Software (available at www.castlecreations.com)
Length: 55mm (2.2)
Width: 85mm (3.3)
Thickness: 5mm (0.20)
Note: Will only work with Castle controller firmware released after 2007