Fox Earphone tactical speaker. Aids in confidential two way communication and especially useful in high noise level environments. Collar securement clip. Compatible with Motorola HT 1000, JT 1000, MT/MTS 2000, MTX 8000/9000, XTS 2500, 3000, 3500, 5000 and EF Johnson 5000, 5100, 7700 and Stealth radios. Was never put into service.