HYS TC-617-1 Listen Receive Only FBI Covert Acoustic Tube Headphone Earphone Earpiece for 3.5mm Jack Plug Cell phone, Two Way Radio, Shoulder Microphone Listen Receive Only 3.5mm Jack Plug With coiled PU cable for retractable use Clear sound performance without distortion for both listen and talk. The Listen only Earphones support two-way radios (audio only), radio speaker mics, remote mics, MP3 players, and other audio accessories with 3.5mm earphone jack. Shoulder Microphone and other devices have a 3.5mm headphone jack