What are the best external detectors that I can use around my detached house, we do get cats and sqirrels etc in the garden, we do have wind and trees, I need the detectors to switch on lighting and sounders.

You could look here GJD

What product are you suggesting.

GJD equipment is excellent - the PIR's are easily adjustable to most external situations. I always recommend GJD when asked for external lighting and other controllers. Pricey - but worth it.

Opal or Elite detectors are what you need to look at!

I think I need to be looking at Dual Tec or Tri Tec products, would you agree?

Dual tech external detectors are much more stable than a standard PIR. Used more for CCTV, they are more expensive. Crow do some very good external stuff - I'd also take a look at their products before you buy.

i would suggest you opt for the gjd pirs and controller, forget about the sounder, if light doesn't scare any one off when it was dark a sounder won't but it WILL anoy the neighbours