True Wireless Headphones
Some Bluetooth in-ear headphones have cables or bands that sit around your neck. True wireless pairs get rid of these making them much more unobtrusive. All the tech is contained within the earpieces.
A carry case not only keeps true wireless earphones protected, it charges them too. You get several charges from a case juice-up for all-day listening.
Digital assistants, playback controls, volume controls and handsfree call mics are features found in many true wireless pairs.