Sony Ultra-Portable NFC Bluetooth Wireless Speaker (White) Delivers 20 Powerful Watts of Audio Power - Two speakers are housed in a bass-reflex design, yielding 20 watts of audio power for rich stereo sound Bluetooth Audio Streaming - Connect compatible Bluetooth devices for wireless streaming of your music or having hands-free phone calls using the built-in microphone Up to Five Hours Playback - This speaker runs either on AC power or its built-in rechargeable battery, which lasts for up to five hours on a charge Bass-Reflex Design - 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 Powered by AC Adapter / Built-In Battery - This speaker is built for portability - it can be powered by the included AC adapter or its built-in battery that lasts for up to five hours on a charge. For added portability, a carrying pouch is also included