Yamaha NX-N500BL Bookshelf Monitor Speaker System (Black), Works with Alexa Works with Alexa for voice control (Alexa device sold separately) MusicCast CONTROLLER app for Apple iOS and Android devices Wireless music streaming via Bluetooth and Airplay High-grade USB DAC that supports DSD (5.6 MHz) and PCM (384 kHz / 32-bit) for high-resolution audio playback Exceptionally high-performance ESS 32-bit D/A converter Discretely configured analog amplifier (bi-amp) produces music with lively dynamism