^^ I fitted one of those poacher alarms to the shed at the bottom of our (long) garden in our first house after we had an intruder. As my Uncle can testify – they’re bloody loud – he’d decided to wander down to borrow the ladder without telling me what he was doing. I think he pretty much sh*t himself.
For us it was more to kick off the dogs, than a deterrent in and of itself. We were the end of a terrace of four houses all with gardens only accessible from the top end. All houses had dogs of various ferocity – one neighbour had some rather scary working GSD/sheepdog thing crosses.
After a spate of local break-ins the agreement was that should someone trigger the poacher alarms the backdoors would be opened and the dogs left to meet the people coming back up the garden. My proposal was for paintball claymores hanging in trees across the gardens…