TASER 15' Replacement Cartridge(s) are compatible with all TASER C2 devices/ X26C/ M18 TASER devices & TASER Pulse products. The TASER Cartridge is one of the features that separate TASER products from the competition, with a distance of 15 feet (4.6m), and accuracy that can't be matched, they are the choice for personal protection. All TASER Cartridges include a patented Anti-Felon Identifcation System (AFID) so that each cartridge use can be traced. TASER cartridges utilize compressed nitrogen to propel two darts to the target. This proprietry design leads to increased accuracy and consistency in field use.