CES 2017: AmpMe app offers free alternative to wireless speakers
6 January 2017 Last updated at 00:21 GMT
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