:D The Electric Mistress is what Andy Summers used during the Police era for his chorus/phaser/flanger like effects - There is a page on the web that analyses his use of effects from old photos - he didn't use a chorus.
Wikipedia says this:
'The Electric Mistress Flanger was famously used by musician Andy Summers throughout his musical career, especially while he was/is in the band The Police. It's ethereal, spacious swirly sound is a key component in Summer's guitar tone, particularly songs such as Don't Stand so Close to Me, Walking on the Moon, Message in a Bottle and De Do Do Do, De Da Da Da.'
Its possible he is also using the chorus from the Roland JC120 on the studio version as well (which I think is the old Boss CE1 circuit).
Is that specific enough? :D
