Shure MX393/C, Condenser Boundary Microphone, Directional characteristic: Half-cardioid, Frequency response: 50 - 17,000 Hz, Output impedance: 180 Ohm, Open circuit voltage: -27.5 dBV/Pa (42.2 mV), Max. sound pressure level (1 kHz at 1% THD (total harmonic distortion), 1 kOhm load): 117 dB, Inherent noise: 23 dB, Common mode rejection: At least 45.0 dB, Power requirement: 11 to 52 V, Power consumption: 2 mA, Interchangeable capsule (modular), Ideal for installation applications, Can be mounted on a table or lectern plate, Remote controllable logic In/Out connections via SCM-810, Built-in preamplifier, Very flat housing, Very linear frequency response with a slight presence boost, Dimensions (L x W x H): 107 x 77 x 22 mm, Includes a plastic dust cover