The Sony ULT FIELD 1 is a portable Bluetooth speaker designed for those who want powerful sound in a compact, rugged form. It features full-range drivers and side passive radiators that work together to deliver audio across a wide frequency range from 20 Hz to 20,000 Hz, while the dedicated ULT button allows you to instantly boost the bass for a deeper experience. To ensure the sound reaches everyone in the room, it utilizes a Sound Diffusion Processor, and if you have two of these units, you can pair them in stereo for a wider soundstage. Built to handle outdoor adventures, this speaker is IP67 rated, meaning it is fully waterproof, dustproof, and even resistant to salt water. Its durability is further backed by MIL-STD 810 H shockproof testing, so it can survive drops from about 1.2 meters onto plywood. The body is crafted using partially recycled plastics and weighs 650 g, making it easy to carry via the included detachable multi-way strap. Whether you place it horizontally or vertically, its dimensions of 20.6 x 7.7 x 7.6 cm keep it unobtrusive in any setting. For daily use, the battery provides up to 12 hours of playback at a moderate volume with bass boost active, and recharging is straightforward via USB Type-C. It supports Bluetooth 5.3 with SBC and AAC codecs for stable wireless connectivity. You can also take hands-free calls thanks to the built-in microphone with echo cancelling, or customize your listening experience through the Sony | Music Center app.