Disclaimer: I received a pair of Aftershokz Xtrainerz to review as part of being a BibRave Pro. Learn more about becoming a BibRave Pro (ambassador), and check out BibRave.com to review, find, and write race reviews!

So what’s up with these Aftershokz Xtrainerz (Cross Trainers)? How do you use them and what the heck do these buttons do?!

First and foremost, let’s talk about storage!

The Xtrainerz can store up to 4GB of MP3s, and before you think that’s not enough space… trust me, it’s enough! These aren’t meant to carry your entire library, but 4GB is a ton of space that can be filled to make use of that amazing 8-hour battery life!

I hook my Xtrainerz to my computer via the USB connector and I can create, mix and match up my music to create playlists based on my mood! Another awesome feature is that the headsets are PC and MAC compatible.

Let’s talk about buttons!

Up-close and personal! Let’s take a look at the buttons and their functions! When I first got my Xtrainerz I immediately put them to use and headed out for a run in one of the last rainy end of summer September days. During my run I played around with the buttons and after coming home and checking out the user’s manual here’s what I found:

Button A is the Multifunction Button, one click turns your music on and off, a long hold turns on or off the power!

Button B is the Mode Button, one click changes between normal, repeat, and shuffle modes. A long hold changes between swimming and normal mode!

Buttons C and D are your volume buttons! One-click changes the volume, a long hold on button C advances one song, a long hold on D goes back one song. Battery levels can also be checked by clicking with no music playing

Pressing the mode (Button B) and volume buttons play the current folder, all folders, or next folder!

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