Silver Wireless Headphone, Rowkin Mini Sports Bluetooth Earbud Headset with Built-in Mic and Portable Charging Case. The World’s Smallest, Cordless, Invisible, Hand-free Earphone for Music and Calls

pros:

it supports  Bluetooth 4.1

portable and very tiny.

The World’s Smallest, Cordless, Invisible, Hand-free Earphone. more info…

Wireless Headphone, Rowkin Mini Sports Bluetooth Earbud Headset with Built-in Mic and Portable Charging Case. The World's Smallest, Cordless, Invisible, Hand-free (Silver)

Wireless Headphone, Rowkin Mini Sports Bluetooth Earbud Headset with Built-in Mic and Portable Charging Case. The World's Smallest, Cordless, Hand-free Earphone for Music and Calls (Space Gray)-3