This works a treat ... through a single brick wall at a distance of 6-8 feet, through a rough fence, from a distance of 20-30 feet with a clear run, and through glass but you've got to experiment with how to make it work best.
We have also doctored it a little with black electrical tape so it doesn't flash at night.
If we're going to be training someone else's dog then this is what we'll have to do! Pooch has learnt though and now knows if he sees us or hears us open a window he'd best pipe down! We still need some time and Pooch can forget at night and awkwardly the room he is locked in is out of the reach of said device but we're working on it ...
I imagine if you were a jogger and you wanted to scare off a strange dog with the light/sound combo it would work VERY well.
Worth the money for a decent night's sleep :o)
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