... SPL)Maximum Level Input 120dB SPL (1KHz,THD 1%)Impedance 600ohm (imbalance)Signal Output Extent 2.5Vpp/-25dbMicrophone ... Detail Introduction********F.TRADIO outdoor waterproof, shouting distance,directional audio surveillance mic,special design for ourdoor talkback, toll ... high-intensity sounds, reliably protecting the back-end audio surveillance equipment* Low noise,low echo and clear speech ...