wireless educational equipment voting system

General Specification:

Works with PCs running MS XP, Vista, and Windows 7.Mac and Linux version available on request.
Transmission distance from handset to receiver: 100 meters radius (328 feet)
Power source: AAA (1.5 volt) batteries for readily available low cost power
System handles up to 3,000 handsets
Impact resistant handsets and instructor controllers designed to withstand accidental drops
Power saver controls turn off handsets after 30 minutes of no use to conserve power and extend battery life. Usual battery life in a classroom setting is two years.
Handset and instructor controller buttons: Positive response buttons (you can feel when you press the buttons) protected by a spill resistant cover.
Receiver connects to standard USB port on a PC
2.4GHz digital RF technology
4 radios channels
Two-way, never jam, never lost
High Speed - 100 audience keypads transmission < ONE second (similar products may require 5 seconds or more).
Super-Wide-angle signal transmission: 360 degrees angle
ID number changeable (compare to the obsolete ID setting mode of similar products), No need to keep a large stock of student remote. (For resellers)
Up to 100 meters transmission and reception distance
Support cascade and uplink option
Support up to 3000 audience keypads
Easy to install, easy to use
Plug-in software of MS PowerPoint
Support self-paced answering.
Multifunctional instructor controller
USB port or 232 port connection
Third party software supportable OEM or ODM acceptablee