Philips Meeting microphone LFH9172/00. Microphone sensitivity: -38 dB, Microphone frequency: 30 - 18000 Hz, Microphone input impedance: 2200 Ω. Connectivity technology: Wired. Cable length: 78.7" (2 m). Operating voltage: 5 V, Power consumption: 0.5 mA. Dimensions (WxDxH): 5.12 x 5.12 x 0.709" (130 x 130 x 18 mm), Weight: 3.81 oz (108 g), Connector(s): 3.5 mm