It's called an "XREP". They can be found below...
"XREP" By Taser International
And below is the weapon that fires them. A specially designed Mossberg 12 gauge shotgun.
X12 - By Taser International
I work as a security guard and I had a former boss say that Taser international was working on building a new Taser with wireless probes. I believe
this is what he was talking about.