The black Sony SRSX2BLK Ultra Portable Bluetooth Speaker allows you to connect your compatible Bluetooth devices and stream music wirelessly or have speakerphone calls. Stereo speakers are housed in a bass-reflex design for rich audio. ClearAudio is designed to deliver powerful bass and crisp highs while Wide Stereo Mode simulates a surround sound mode. Enjoy simplified Bluetooth connectivity with Near Field Communications (NFC) technology. This speaker runs either on AC power or its built-in rechargeable battery which lasts for up to five hours on a charge. Adding portability is the included carrying pouch.