Buy from Amazon : http://amzn.to/1xZh0Up

Epson V12H005M09 Quick Connect Wireless Key For Accs All Wireless Projectors

Wirelessly project content from a computer to your compatible Epson projector
Provides fast ad hoc wireless connectivity PC only
No need to connect over a network
Simply plug in the USB device and the key will download the information necessary for setup
Original settings are restored after your disconnect with no reconfiguration required