 Although to the density of haze generated and the volume of space that can be filled is significantly smaller than that of a haze machine, aerosol canisters have the advantages of portability, no requirements for electricity and finer control over the volume of haze generated.Ultrasonic haze machines use transducers submerged in a reservoir of fluid to create atmospheric effects.Although less common than some of the other technologies used to produce haze, ultrasonic hazers are promoted as generating their effects with much less noise than other technologies.