Each removeable cartridge fires exceptionally potent liquid 10% OC at 590 FPS from the nozzle with an effective distance of 23 feet. With ease of training and the power of each super-strong pepper payload has made the JPX very popular among law enforcement and corrections professionals world-wide. The JPX 4 carries four self-cleaning pepper rounds, making multiple shots available when needed. Reloading is fast and easy.  You can load each round individually so that you always have 4 rounds available.Some of the benefits:Limits liability associated with discharging a firearm / shooting an attacker or burglar. Looks and works like a gun Can carry in places you can't carry a gun Holds four shots (included) of exceptionally potent liquid will disable attacker at least 45 minutes Ssuperior to tear gas even when used against attackers under the influence of drugs Quickly Reloadable 4 individual cartridges (refills available) Light enough to carry easily (about 12 oz empty-20oz full) Launches the spray at 590 FPS from the nozzel.  Same velocity as 2 shot JPX 23' range. . . you don't need to be close to your attacker Accurate using the sites as opposed to trying to spray someone with a little canister Police grade, serious solution Less affected by wind Not susceptible to heat or cold Doesn't need to be shaken Waterproof No batteries to charge Measures: 7.60” L x 1.38” W x 5x67” H 2 year manufacturers warranty registration is available at www.piexon.comOpinion from the ATF: The Piexon JPX does not constitute a "firearm" as defined in the Gun Control Act or a "firearm" or "any other weapon" as defined in the National Firearms act. Also, the magazines designed for this device do not constitute "ammunition" as defined in the Gun Control Act". NO REGISTRATION REQUIRED IN MOST STATES.