Sonic Cat Collars

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Has anybody heard of these, or know where to get one?

I'm desperate.

Youngest rescue cat is bringing birds in. Mrs Blackbird tonight I feel so guilty. dh is furious with him and has blocked the cat flap up, but he tends to go out late afternoon and spend the evening hunting. I can't keep him in all the time can I?

I've read that you can get sonic collars which warn prey when there's a predator approaching. I've searched online, but can't find any

tis here

It's okay, I've found one

The liberator. I had one on my cat a few years ago...she still caught things, but it did make it less frequent.

Good job too because the one I linked to has been discontinued, lol