Code Red Guard Listen-only Earpiece . 5 mm threaded connector for the Motorola Speaker Microphone. The Code Red Guard-m2 Earpiece is designed for active use applications and features a soft flexible hook which fits snuggly over the ear. The Code Red Guard-m2 Soft Earpiece w/ Threaded Connector connects to radio microphone adapter with 3.5mm threaded connector. Package Contents: Code Red Guard-m2 Earpiece