Smoke generated by Testifire is delivered via capsules. The use of capsules offers a number of benefits over traditional aerosol canisters. Testifire generates its nontoxic smoke stimulus from a specially formulated, fluid supplied in a replaceable non-pressurised capsule. The number of tests from a capsule is dictated by the response time of the detectors under test and can range between 500 and 1,000 tests. Although there is much more to the comparison than material cost, typically this equates to between two and five times that produced by an aerosol.