Devialet VY510US Accessory - Dialog - Wireless smart hub for Phantom Dialog is the hub that allows you to connect several Phantom together wirelessly, from 2 Phantom to 24 Phantom, to create Hi-Fi or Multi-Room systems Dialog is necessary to connect more than one Phantom for a multi-room or stereo experience Dialog is not necessary to play online streaming services through Bluetooth to one Phantom Designed and assembled in France