Hard-Wired 1.8m USB Type A Lead. Compact and Low Profile. Omni-Directional PickupType: Electret Condenser Polar Pattern: Cardioid Frequency Response: 20Hz-20kHz Sensitivity: -52dB Lead Length: 1.8m Dimensions: 19 x 62mm (Microphone Only) Weight: 118g (Microphone Only). Miniature circular boundary microphone with inbuilt plug and play USB audio interface. All-metal housing with a hard-wired lead to USB type A connector for connecting to a laptop computer to pick up speech for video conferencing- webinars and other recording applications.. boundary microphone