Nokia headset / handsfree HDB-5 connector and schematics pinout diagram @ pinouts.ru
BRB Product _ Headphone Splitter, MillSO Jack Headset Adapter CTIA Audio Splitter Adapter Cable 2 Male to Female with Separate Microp - Walmart.com - Walmart.com
PC) Gaming headset for Xbox One, but mic issues - Ars Technica OpenForum
3.5 mm Headset: Accessory Specification | Android Open Source Project
Die zwei möglichen Belegungen des Klinkensteckers bei Smartphones | Seite 3 – Android-Hilfe.de