We pulled just under five hours out of it with brightness turned all the way down, the sound off and no rumble, but averaged around 3.5 hours in general use.

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All it knows is how to sound off authoritatively.

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When the Saturday night of the 2013 contest rolled around, all the pubs in Dublin were tuned to Eurovision, but the sound was off or woefully low.

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We're big fans of this seemingly benign option because it combines the physical gesture of turning the sound source away from you with the software response of switching all audio off.

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Built with three high-audio-amplitude-capture (HAAC) microphones and one of the most advanced loudspeakers available for smartphones, people can record and play back the sound just like they first heard it, all the way up to 140db - the sound equivalent of an airplane taking off.

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And then comes for me the unpleasant bit when they all go off, 100 people - actors and camera people and film and sound - and I stay away.

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