Thanks for the extra info - I did realise I'd need the transformer,adapter lead and enclosure box thanks.
When those buttons are described as "sealed", does that mean they're waterproof (as in can be exposed to rain)?
The appearance is not too important as it will be either in the shed or under the decking that covers my filters. But if the button is waterproof, I could fix it through the perspex window of the shed.
That way, the box of tricks can be inside in the dry, but it can be operated from outside (save me having to remember the key to unlock the shed when I go out to feed the koi) 
It's an age thing! 
Cheers
