Model : MAESTRO Phantom PS Mic Capsule : Fix Charging blackboard     static condenser Frequency response : 30 Hz – 18 kHz Polar pattern : Unidirectional Sensitivity : -40dB 0dB 1kHz Output Impedance : 0 Max SPL : 138 dB 1Hz Capsule Freq Response : 100 – 150 Meters SN : 80 dB Phantom Power supply : 28-48V, Current consumption of  6,3 mA Typical Power working time : < 10 Hours