Yard Sentinel??
I bought this item to deter bulb stealing squirrels. It does everything it says on the box but doesn't deter squirrels. In fact they sit in front of it preening themselves. Whatever 'sounds' eminate from the device they don't scare squirrels. i have it operating on the mains adapter so no chance of flat batteries. I have been operating it for some months and have tried many different settings,despite it being a right pain in the backside removing and replacing the back panel,especially in cold weather when the plastic is very stiff. I have two other similar devices,all mains operated, none of them scare squirrels. I'm beginning to think they use the sound waves to dry their fur. Only one good thing I can say about the Sentinel is that I haven't seen next door cat since I fitted it. (Not seen any rabbits,deer of foxes either!) Sorry but I can't recommend this gadget.
Verified purchase: YesCondition: New