What I really want, is a small electronic device that can fool the gunshot detectors. I realize that the easiest way would be some kind of hopped up firecracker

What I really want, is a small electronic device that can fool the gunshot detectors. I realize that the easiest way would be some kind of hopped up firecracker, but the use (even minute amounts) of explosives would probably be bad. This device might only get 1 or 2 uses without recharge, that'd be ok. But I'd like for it to be light enough to be carried by drone. And if somehow they could be programmable to sound like different calibers, even better. They could just go out on night missions, running the cops ragged.