Sound: stereo Frequency response: 20 Hz - 20 KHz Speaker size: 50 mm Speaker sensitivity: 117 dB ± 3 dB Speaker impedance: 21 O Microphone type: omnidirectional Microphone size: 6 x 5 mm backlight: red LED Connectors: 2x 3.5 mm jack, USB (for LED light) Cable length: 2.1 m OS support: Windows 7 or newericrophone sensitivity: -42 dB ± 3 dB