Create a wireless 2.1-channel streaming audio system with this B&H Kit that includes two white Yamaha MusicCast 20 Wireless Speakers and the Yamaha MusicCast SUB 100. They connect to each other wirelessly via MusicCast and to your compatible device via Bluetooth or AirPlay. Additionally, MusicCast equipment can be controlled either by your Amazon Alexa-enabled device or via the MusicCast app for iOS and Android.