A new Guinness Surger can has been launched that aims to let licensees know when the drink is ready to serve.
It coincides with the launch of a £3.5m Christmas ad campaign for Guinness.
The Surger device sees bar staff pouring a special can of Guinness, which does not include a widget, into a pint glass. The glass is put on an electronic plate that releases soundwaves into the liquid and creates a creamy head.
The new can has colour-changing ink to indicate when it is ready to serve.
The move indicates that Diageo is keen to invest in Surger, which is aimed primarily at low-volume Guinness stockists. In the summer the MA reported that Punch has been trialling the device at pubs in northern England.
Over Christmas, Diageo will be emailing 300,000 consumers with a Guinness-branded baton that lets them play songs on pints of the black stuff online.
A viral video will show how to play tunes such as Jingle Bells.
Meanwhile, a festive version of its World ad campaign will run from December.