SHURE BETA 91 condenser boundary microphone, combination of Beta 91 and SM 91, switchable frequency curve for Bass-Drum or Piano/Speach application, half cardioid, 20 - 20.000 Hz, 146 Ohm, 11-52 V Phantom, 155 dB SPL max (on 2500 Ohm Last), XLR male out, weight 480g..