When you don't want to be bothered with cables, use the new BenQ LinkPro to run your presentation from a PC wirelessly. The BenQ Wireless Wizard software makes it easy, with automatic connections and easy switching among multiple PCs. The BenQ LinkPro is compatible with BenQ "MP620", "MP770" and "MP720p" projectors. 1,024×768 pixels images can be transmitted clearly for a maximum distance up to 20m via wireless LAN. For computers without WiFi, LinkPro let you connect via an Ethernet cable.

You can even allow 10 computers to access the projector by using a switching hub. The BenQ LinkPro measures 196×81×86mm weighs 276g and is available for approximately 29,800 Yen ($260).
Via BenQ (Japanese)