It's all about the bass with the Sony ULT FIELD 7 Wireless Speaker. This speaker features the X-Balanced speaker unit, which delivers rich bass sound with the help of dual 4.5" non-circular woofers and passive radiators positioned on both ends of its tube-shaped body. If you're craving even more bass, simply press the ULT button twice to choose between two levels of bass: deep low end or powerful punchy bass response. As part of the ULT POWER SOUND series, the ULT FIELD 7 is designed for outdoor gatherings and parties that last till dawn. With an IP67 rating, it can withstand dust and water, while a full charge provides up to 30 hours of playback. To elevate your hangout or party, the speaker features multi-color LED ring lights on each end, as well as an input for an optional guitar or karaoke microphone.