ULT Button Press the ULT button to feel the Massive Bass Perfect on the Go Compact, easy-to-carry design with a detachable multi-way strap Long Battery LifeUp to 12-hours battery life IP67 Rating Waterproof, rustproof, and dustproof this speaker is ready to party outside Available in Four Colours With Black, Off White, Forest Gray and Orange to choose from, find the color that suits you best Hands Free Calling Built-in microphone with echo canceling technology for clear calls Music Centre App Control the party with SonyMusic Centre App and Fiestable App