MIGHTY is the first ever device that plays your Spotify music without a phone, screen, or Internet connection.
THE NEW MIGHTY VIBE is new and improved:
5+ hours of playback with Bluetooth and wired headphones
Expanded Bluetooth playback range and stronger connectivity
Compatible with all Bluetooth headphones and speakers
Redeveloped mobile app for an intuitive and fast user experience.. More here.
An interesting idea and not a terrible price. Good for adventures when you do not want to take your phone.