its.caltech.edu/~aigp22/USA/StunFacts.html

https://epsstuntech-security.co.za/products/prisoner-stun-belt/

I find the fact these exist fascinating. Has anyone ever heard of the concept being refined for BDSM use with the power levels being just slightly toned down?...or of one being used by a Domme in session?

I've seen the Fancy Steel devices but the power levels seem pretty low and I'm not sure they can't be disabled by the wearer if their hands are free. That the device is locked on, can be controlled via a remote and can't be removed or disabled by the sub would be a real mind f*#k. I think it would be a huge addition to a multi hour or multiday captivity session....or for anyone into adding elements of prison play to a session.
Obviously edgy and on the RACK end of things but........... for anyone into those type of sessions I think one of these perhaps with multi settings ranging from a warning "bee string" to something unbearable that could drop you to you knees (sort of the electro equivalent of a very hard kick in the balls) would be an amazing piece of gear. Just the knowledge that the Domme had total control would add tremendously to the session IMO.

I've seen these referenced in BDSM fiction in several books but don't think I've ever heard of something like these actually being used in a session.

I'm guessing some of the practical issues would be getting something in a small enough package and it having enough of an impact on the sub for real control while still being relatively safe.