Hi there!
I've got an ultrasonic repeller and have found it works really well. I was a bit sceptical at first as I'd heard mixed reviews, but eventually decided to try one because nothing else seemed to get rid of the mice in our house (and I refused to try those disgusting glue traps). After a couple of days, we were mouse free, yay!
So ,yeah, I definitely recommend them. I got mine at this site if you want to check it out as it was really good:
http://www.primrose-l...terrents-c-24_25.html
The one I have is indoor only, but I'm pretty sure I saw that they had ones suitable for outdoors too.
Good luck! Media URL: http://www.primrose-london.co.uk/pest-control-mouse-deterrents-c-24_25.html
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