Only compatible with Polycom SoundStation2W EX Microphone cords extendable up to six feet Lets you increases the number of participants from 15 To 25 Package includes two EX Microphones and two Six Foot Cables Extra Microphones will not work without the Polycom SoundStation2W EX (#2200-7800-001) - 1 PAIR foruse the 2WSoundStationEX Wireless Conference phone
These work great, the problem is the cord is too short. The mics end up being close enough to the original mic that you don't really need these mics. The microphone on the base unit is good enough that I don't think these extra mics warrant the purchase.
Polycom, that doesn't mean make the base unit microphone worse on your next unit. It means make the cords longer on your extra microphones.