Introducing the Poly Expansion Microphone Kit for SoundStation2W (Expandable) only. Includes two (2) expansion microphones and two (2) 2.9m/9.7ft expansion microphone cables. Low power consumption. | 2200-07840-101. As an Authorised Poly Partner, we offer the best price and excellent service. Our dedicated team is here to find your perfect solution. Request a quote or contact us now for prompt assistance.