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Sony's SRSBTX300 is a mid-range portable and wireless speaker system that is based around a 20W, two-speaker and subwoofer sound setup, with passive ventilation that improves lower frequency output. Ease of use is one of the primary features of this model, and many of its functions cater to this. These include Near Field Communication capabilities, which allow it to communicate instantly with compatible devices (for example, certain smartphones) to instantly pair and stream music. It also communicates via Bluetooth and can thus stream from any Bluetooth-ready device as well. Other features include a rechargeable battery (Sony estimates this to give about 8 hours of continuous usage), dedicated speakerphone button, and rear USB input that can charge portable devices, even if the player itself is not plugged into AC power. For portability, this speaker comes with a protective carrying case.