Sony SRS-XB13 Extra Bass Speaker

Ultra-compact, lightweight and easy to take with you, it includes a convenient strap so you can hang it wherever you like. Sound Diffusion Processor technology ensures a big sound despite its size, with Extra Bass for added punch. It's IP67-rated waterproof and dustproof, boasting up to 16 hours' battery life, and you can pair two together for super stereo sound.