Headphone Jack and Plugs: Everything You Need to Know - Headphonesty
Why do we call them headphone “jacks”? – Mashed Radish
Phone connector (audio) - Wikipedia
Differences Between 2.5mm, 3.5mm & 6.35mm Headphone Jacks – My New Microphone
Headphone Jack and Plugs: Everything You Need to Know - Headphonesty
The 19th Century plug that's still being used - BBC News
The Physics of How Your Earphone Jack Works (Just in Time to Say Goodbye) | WIRED
Apple MFi Certified] Lightning to 3.5mm Headphone Jack Adapter, 2 Pack 3.5 mm AUX Headphone Audio Stereo Connector Compatible for iPhone 11/11 Pro/XS/XR/X 8 7/iPad, iPod, Support Call & Music Control Audio