Amazon.com: Retevis Earpiece Adapter for Walkie Talkie,2 Pin to 3.5mm Headset Adapter Only Compatible RT22 RT21 RT27 RT7 H-777 H777S RT18 RT19 RT22S(Not Fit for Other Brand) 2 Way Radio (5 Pack) :
Adapter Audio gn. mini Toslink (cyfrowy Jack 3,5mm) - wt. Toslink