Pm-660U Desktop Paging MicrophoneMicrophone Paging Desktop • Desktop Type Dynamic Microphone With Cardioid Polar Pattern. • Short-Off Press To Talk Switch With Open Off Type Extra Switch Contact. • Low Handling Noise. • 600 Ω Balanced Output Impedance. • 2.5M 4-Conductor (Included Twin-Core Shielded) Cable Without Plug. • Can Be Remotely Operated With Additional Components Such As Priority And Transmitting / Receiving Relays FeaturesTypeMicrophone Frequency Response100 - 10 KhzSensitivity-58 DbWeight440 GDimensions W X D X H99 X 150 X 216 MmDesktopYes Warranty1 Year