We are looking for a fully wireless, self install inturder system for our Gardeners Yard, we would need a few internal motion detectors and door contacts and some external gate contacts, we also would want some external sirens. We do have some power in the building for the base, but no internet and very little 4G signal., Is this something you can advise on?

You can use either the HKC with standalone contacts in enclosures eith HD external contacts

or the pyronix enforcer. 

Both will function without internet but notifications wont be possible,

Note our products are designed for professional installer use