An iPod Shuffle esk device has this week launched on the Kickstarter crowdfunding site, designed similarly to that of the iPod Shuffle, but only for support with Spotify.
Basically, the device allows you to take Spotify offline without the need for a smartphone, in a small and portable device. It weighs just 0.6 ounces and measures just 1.5 inches square.
It is capable of storing up to 48 hours of music offline, and can be connected to an Android smartphone or iPhone, with WiFi and Bluetooth built in, allowing it to be connected to a speaker.
It also has a headphone jack so you can use any pair of headphones or earphones you desire.
You can read more about Mighty, and back it at the source link below.