https://www.dealtikka.com/1-pin-covert-acoustic-tube-earpiece-headset-for-motorola-cobra-talkabout-walkie-talkie-two-way-radio-1pin-5pack/
1 Pin Covert Acoustic Tube Earpiece Headset for Motorola COBRA Talkabout Walkie Talkie Two Way Radio 1pin (5Pack)