So you want to listen to your Spotify music on the go without your smartphone? Mighty can help. It is a simple WiFi/Bluetooth enabled music player that works with iOS and Android devices and plays 48 hours of music without an Internet connection. Mighty is compact, lightweight, and drop resistant.
To get started, download the app, sync your music, and you are set. The device has physical buttons to change volume settings, start/stop music, and more. the device is powered by Android with your phone working as a remote control for it. Yet another interesting Kickstarter project.