Designed to work with canons rt wireless radio flash system as well as canon non radio ettl flashes the phottix laso flash trigger system enables users to control and trigger canon rt system radio enabled flashes the laso receiver works with canons non radio ettl flashes users can then control and trigger these flashes from different radio devices including the phottix laso transmitter canon st e3 rt flash transmitter and canon radio enabled flashes the laso receiver can also be conne