JK Audio ComPack Jk Audio ComPack Universal Telephone Audio Interface - Jk Audio 2 Year Limited Warranty Inputs: Female XLR: 1000 Ohms, mic/line switch -35 dB pad3.5mm: Line level, 20kOhmss, 250 mV, (-10 dBm) RMS Outputs: Male XLR: Phone mix mode - balanced 600 Ohms, 15 mV, (-25 dBm) RMS intercom mode - bi-directional unbalanced1/4" jack: 8 Ohms, 500 mW Power: 9V battery or AC power supply (included) Dimensions: 8 x 3 x 2.2" / 20.32 x 7.62 x 5.59cm