Quick and easy DIY beyerdynamic DT 770 Pro mic mod (detachable mic) : r/ headphones
DIY Clearcom headset : r/livesound
ONITOON DIY Kids Headphones with Microphone, Wired 85dB Volume Limited Over-Ear Headset, Foldable and Share Port for Toddler, Child Girls, Boys Travel School Phone Pad PC Tablet (Pink Blue) : Amazon.com.au: Electronics
How Do Headphones Make Sound? (A Simple Beginner's Guide) – My New Microphone
How to Make Your Headset Mic Sound Better on Any Platform - Headphonesty