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Impact PRSMA-AT4-SH 3.5L 3.5mm Straight Acoustic Tube Listen Only Speaker Microphone Impact GRSM-HD1 medium duty speakerImpact PRSMA AT4 SH 3. 5L Platinum Listen Only Earpiece with Straight Acoustic Tube. 3. 5mm right angle connector. 9 inch coiled cable (relaxed). This is a professional grade listen only kit to use with your Impact or other brand speaker microphones. This earpiece is the ideal solution for the professional user who can't afford anything less than the best! Used by thousands of law enforcement agencies, security companies, casinos, and hotels