SUNDELY Covert Acoustic Tube Headset/Earpiece Police PTT Mic for HYT (Hytera) Talkabout Radio Walkie Talkie TC310 TC320 TC1600 TC1688 1-pin Covert Acoustic Tube Headset/Earpiece Police PTT Mic for HYT (Hytera) Talkabout Radio Walkie Talkie 1-pin, Hidden mic in PTT button, 1 spare earbud included TC310, TC320, TC1600, TC1688