Lasting Battery: The ULT FIELD 1 speaker gives up to 12 hours of battery life Design: The speaker has an easy-to-carry design thats waterproof, dustproof, and shockproof Special Processor: The Sound Diffusion Processor expands sound in any space with its DSP technology Microphone: The built-in microphone lets you enjoy hands-free calling via your speaker, with echo-canceling technology for clear calls Unparalleled Bass: The Sony ULT FIELD 1 Bluetooth Wireless Portable Speaker enhances your low-end frequencies for exceptional bass, thanks to the ULT button