The free rival to Sonos wireless speakers
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The free rival to Sonos wireless speakers

A free app synchs smartphones so they play music in unison, creating a free alternative to expensive wireless sound systems.

A start-up is promoting a free app that syncs smartphones so they play music in unison, at the CES tech show.

AmpMe is being pitched as a free alternative to Sonos and other brands of wireless speakers.

Chris Foxx tied out the tech in Las Vegas.

Follow all our CES coverage at bbc.co.uk/ces2017