Yes, there are such devices, but they are illegal, and having one with you would land you some serious trouble.
It's a pretty simple device: it just needs to spam noise in a couple frequencies.
What do you need it for?
If you consider the risk worth it (and it's a pretty big risk! they are detected as soon as you turn them up...), probably the best way of getting one would be buying any software-defined-radio device, and doing some coding.
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