Polycom SoundStation2W Ex Mic Pods (2200-07840-001) 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)