AV-JEFE CM520 Professional Lavalier Mic with Mipro / Peavey / Beyer Mini 4pin Screw-On Connector Great Quality Professional Lapel Mic !!! Compatible with Peavey Transmitters: PCX-V12-B, PCX-U302-B Compatible with Mipro Transmitters: ACT-707-TS (TE), ACT-801 TS (TE), MT103, MT303, MT801, MT808 Compatible with Beyer Transmitters: Opus Series, TS-100, TS-300, TS-500, TS-800 For Peavey / Beyer systems: Please see Product Description for important info.