Sony ULT Field 1 Electronics, Waterproof Speaker Compact and Portable Design, Enhanced Bass and Sound Diffusion, Long-Lasting Battery Life, Wireless Speakers with Bluetooth SRSULT10W, Gray. Features: IMMERSIVE SOUND: Dive into a world of immersive sound with the Sony ULT Field 1. Whether you're an Android or an Apple user, this blue tooth speaker wireless for iPhone and other devices will enhance your music experience with its unique bass-boosting feature. PORTABLE DESIGN: Outdoor bluetooth speakers need to be portable and durable, and the Sony ULT Field 1 is no exception. As one of the most portable bluetooth speakers, it comes with a detachable multi-way strap, making it the perfect companion for any adventure. DURABLE: When it comes to bluetooth speakers, the Sony ULT Field 1 stands out with its IP67 rating, ensuring it's waterproof, rustproof, dustproof, and shockproof. This blue tooth speaker is a reliable choice for those who lead an adventurous lifestyle and need a speaker that can keep up. LONG-LASTING BATTERY: The Sony ULT Field 1 is not just a portable speaker, it's a powerhouse with up to 12 hours of battery life. Ideal for long listening sessions, these speakers bluetooth wireless ensure uninterrupted music enjoyment, even when charging may not be readily available. SURROUND SOUND: Outdoor bluetooth speakers should provide a surround sound experience, and the Sony ULT Field 1 does just that with its sound diffusion processor. This blue tooth speaker fills up any space with sound, taking your music listening experience to a new level.