Building on the success of previous Turtle Shells, the 3.0 brings note-perfect sound along with new features that put it leaps and bounds beyond run-of-the-mill competitors. The rechargeable speaker boasts a 25-hour battery life (at mid-volume) and a built-in power bank that allows you to charge your other electronics on the go. On top of that, the entire unit is waterproof and even floats.