the t.bone BD 500 Beta, Condenser Boundary Microphone, Polar pattern: Semi-cardioid, Switchable frequency response for bass drum or piano / voice applications, Frequency range: 30 - 20,000 Hz, Impedance: 230 Ohm, Sensitivity: -53 dB, Robust metal housing, XLR male output, Holes on the back for suspending, Bottom with 3/8"" internal thread and non-slip rubber for stability and to protect sensitive surfaces, Dimensions: 95 x 123 mm, Weight: 480 g