Like an iPod shuffle for Spotify, the Mighty device let’s you leave your phone at home and still bring Spotify—and all your favorite music and playlists while you sweat through your workout. It features simple, straightforward controls and a clip on the back for attaching it to your shirt or pack. A free app links Mighty to your Spotify account & it uses wi-fi to download your music. It syncs with your wireless headphones using bluetooth.