The Sony SRS-ULT10, also known as the ULT FIELD 1, delivers powerful, bass-heavy sound from a compact and portable design. Press the dedicated ULT button to activate enhanced low-end frequencies for a heart-pounding audio experience. Its Sound Diffusion Processor, combined with side passive radiators, ensures expansive, room-filling sound. Built for adventure, this speaker is IP67 rated waterproof, dustproof, rustproof, and shockproof, making it ideal for outdoor use, including at the beach. A versatile multi-way strap allows for easy carrying, while the 12-hour battery life keeps the music playing. For a more immersive experience, wirelessly connect two speakers for rich stereo sound. It also features a built-in microphone with echo-canceling technology for clear, hands-free calls.