Prepare your ears for an unprecedented experience. The D4 features a Bass Reflex system that will enhance basses when you stream your favorite music to the D4. The D4 was designed to be used on the go as it combines compact dimensions, light weight, and a strap to carry it easily. No wires, and up to 12 hours of battery life, this small speaker is perfect for outdoors use. Choose the color that most fits with your clothes or personality and show off wherever you go with its smart design.