Amazon.com: Pyle 8 Channel Wireless Microphone System - Portable VHF Cordless Audio Mic Set with 1/4" and XLR Output, Dual Antenna, - Includes 8 Table Top Mics, Rack Mountable Receiver Base -
Conference Table Microphone Sound System with SoundTube Speakers Crown CDi 1000 Amplifier and 7 Shure MX395
Monoprice Wireless Omni Directional USB Conference Room Mic and Speaker, 360 degree with Noise and Echo Cancellation - Monoprice.com
Wireless conference system support 256 units microphone