The Helite CO2 cartridges are easy to replace and simple to use. You can replace cartridges yourself in just a few minutes, without any assistance from an authorized person. 

In the event of a fall, replace the empty Helite CO2 cartridge with a new one of the same size. The size of the cartridge is in proportion to the size of the Helite airbag. Helite reccommends only using Helite brand replacement cartridges to ensure the proper fit.  Helite cartridges have a 10-year guarantee and no expiration date. A cartridge is always included with the purchase of an airbag vest.