Sony XB23 EXTRA BASS Portable Bluetooth Speaker – Black Key Features EXTRA BASS sound Compact, lightweight, and highly portable Waterproof, dustproof3 (IP67 rated) and shockproof X-Balanced Speaker Unit for clear, powerful sound Frequency Transmission Range 20 Hz - 20,000 Hz (44.1 kHz sampling) Overview The Sony XB23 EXTRA BASS Portable Bluetooth Speaker is highly portable, being lightweight and compact. This makes ideal for camping and taking to the park to enjoy some music with friends. A convenient strap allows for convenient placement on trees and tent posts and is small enough to easily fit in cup holders. It has a durable design which includes an IP67 rating, meaning it is waterproof and dustproof so you can take to the beach without any worries. Being tough it is ready for anything, so you can enjoy yourself and have fun. The X-Balanced speaker unit features a newly developed non-circular diaphragm. This maximises the sound pressure for more powerful bass without distortion. Stand it up or put it on its side, it does not matter as the SRS-XB33 can be used horizontally or vertically.