Polycom Communicator C100S. Frequency response: 3000 - 19000 Hz. Dimensions (WxDxH): 133.3 x 82.3 x 21.6 mm, Weight: 151 g. Operating temperature range (T-T): 5 - 40 °C, Storage temperature range (T-T): -30 - 50 °C. Minimum system requirements: Internet connection; PC with 1 GHz processor; 256 MB RAM;