Dell Wireless Mouse WM311

(couldn't find an appropriate forum for this question)

The Dell Wireless Mouse with "Nano Receiver"  WM311 also describes the receiver as "USB mini receiver with concealed, fold-up storage"

http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&sku=330-6862

I'm looking for a receiver like the Logitech M305:

http://accessories.us.dell.com/sna/products/I_O_Devices/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku=A3881040

Are the receivers the same?  Or is the Dell receiver bigger that actually folds?

TIA