The hard plastic earbuds included with the CAT B25, which includes a microphone with a button to the left, being the left cable shorter than the right. It connects via a narrow micro-USB connector to fit into the phone.
<a href="//commons.wikimedia.org/wiki/User:MarcoTangerino" title="User:MarcoTangerino">MarcoTangerino</a>
<span class="int-own-work" lang="en">Own work</span>