Nikon WU-1a Wireless Mobile Adapter for Nikon Digital SLRs
I bought this mobile adapter on Amazon (http://smile.amazon.com/gp/product/B007VGGIB6/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1) before realizing it didn't work with the D5100. It's new without the shipping box, but with it's hardcase...
