Loudhailer diameter: 50mm (NdFeB) 7.1 simulated sound channels Frequency range: 20~20.000Hz Sensitivity: 115 +/- 3dB at 1 khz Impedance: 32 Ohm at 1khz Maximun power input: 30mW Input plug: USB Mic: 6*5mm condenser microphone Mic sensitivity: -54 +/- 3dB Mic Frequency Range: 50-10KHz Mic Impedance: <= 2.2 ΚΩ at 1 khz Cable length: Approx.2.2m Accessory: Driver CD