Technical specification: Input Power: DC24V 900mA Input Sensitivity:50mV Input Impedance: 100KOhm Output Impedance:12~600 Ohm Dynamic range: 84.6dBA((300 ohm) 89.8dBA(33 ohm) Gain:20dB Frequency response:10Hz-60KHz +/- 0.25dB MinimumSale Price:$60.00Read More[amazon-product-reviews]