These cartridges are designed for use with the Targeted Electrical Discharge System (TESLA). They are capable of providing short 20,000 volt arcs of projected electricity, causing non-lethal fibrillation of neuromuscular fibres and loss of consciousness. They are single-use.
6 rounds can be found in the Tai Yong Medical vault in the Palisade Property Bank.
8 rounds are found in a weapon case in the locked area, under the railroad, to the southwest of The Music Box.
If all optional objectives were completed in M1: Black Market Buy, during the third visit to Prague, 2 rounds will be found in the Jinn stash, in the storage unit with double doors near the pedestrian bridge.