Boundary Conference Microphone is designed for use with Conference Recording System 955, all Analog and Digital Pocket Memos and Desktops. Daisy chain features allows you to connect up to six microphones. Nondirectional design allows sounds pick up from a 360-degree radius for excellent recording. Boundary layer design utilizes the acoustic pressure of the surface and special rubber lamination to minimize vibration and filter extraneous noise. Microphone is easy to set up. No microphone stand required. Simply place the Conference Microphone on the conference table. Microphone includes a 3.5mm to 2.5mm adapter plug and an analog adapter plug. Sensitivity: -38 dBV. Frequency response: 30Hz to 18kHz.