With an IP67 rating, this portable wireless speaker offers a waterproof, dustproof, and rustproof performance that makes it perfect for outdoor use. Sony’s original X-Balanced Speaker Unit and a vertical passive structure produce clear, powerful sound. The outer fabric ensures the quality of sound and is extremely durable and even washable. The SRS-XB23 is compact enough to fit in a cupholder and comes with a convenient strap for greater portability. This is as good as it can get in terms of sound, durability, and portability.