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IMPRES SPEAKER MICROPHONE W/VOL IP57 PART NUMBER PMMN4046A AUDIO JACK N - EMERGENCY BUTTON Y - VOLUME CONTROL Y - PROGRAMMABLE BUTTON Y - IP RATING IP57 - INTRINSIC SAFETY STANDARD UL-TIA4950 FOR DP4000E SERIES/FM - ACOUSTIC WINDPORTING OMNI-DIRECTIONAL -HOUSING LARGE