First announced in September, the Sonos BOOST is now available globally from select retailers and sonos.com
The BOOST is the most powerful wireless product we’ve ever created and was designed to keep the music playing in even the most challenging of wireless environments. Featuring enterprise-grade wireless performance, the BOOST connects to your home router and creates a dedicated wireless network similar to the BRIDGE, but with more power and better interference mitigation.
Software support for the BOOST is available by updating your Sonos to version 5.1.1. To update your Sonos prior to installing a new BOOST, select Update Now from the Music menu or follow the instructions here
You’ll find more information about the BOOST at the Sonos Blog