The B2 is a premium powered speaker with high-fidelity stereo sound that connects to your music in seconds from any app or device. Clear, full and powerful audio that fills most rooms, the B2 Wireless Speaker is constructed with custom Audioengine components: aramid fiber woofers, silk tweeters, high-fidelity aptX Bluetooth, and built-in power amps wrapped in precision tuned, hand-crafted cabinets.