Philips 9172 Boundary Layer Conference Microphone for Digital Conference Recording Systems (LFH9172/00) Built-in wire storage for adjusting cable length Built-in wire storage for adjusting cable length Built-in wire storage for adjusting cable length Fast and easy set up for hassle-free installation with wire storage and length adaptation build into base Sound pick-up from a 360 degree radius for a perfect recording experience Boundary layer design utilizes the acoustic pressure of the surface Expandable through cascading No microphone stand required