So you signed up for Spotify Premium to have a world of music at your fingertips while you run or exercise. Great. Problem is, now you have to have your Android device or iPhone flapping around in your pocket while you get your workout in, which is beyond annoying. Mighty offers another alternative. Mighty is the first device that plays your Spotify music without being connected to a smartphone. It’s lightweight, durable, and can play 48 hours of music without any internet connection. Simply pair Mighty with your smartphone through an app, sync your music, and then leave your phone behind when you just want some tunes. If you have Spotify Premium and like to workout, it’s a must-buy.