Audio-Technica AT9921 Mini mono boundary condenser mic for digital recording. Designed for use on portable recording devices, digital cameras and desktop computers
Element: Back electret condenser Polar Pattern: Cardioid / Omni-directional switching Frequency Response: 100 – 15,000 Hz Power Requirements: Battery / Plug-in power, 300 house battery life Dimensions: 24.5mm x 55mm x 61mm Output Connector: 3.5mm L-type gold plated mini jack