The falcon eyes hs-15 hotshoe adapter is ideal for integrating a speedlite into a flash set. the speedlite simply slides into the hotshoe connection and if equipped with a slave function, will flash when triggered by the other flash units. alternatively, a synchronization cable can be connected to the hs-15 to trigger the flash unit.the hs-15 can be mounted on a light stand with a standard ¼” male thread. further, it is possible to use the hs-15 in combination with the falcon eyes 4m4f-ur umbrella holder to create a separate flash unit. the 4m4f-ur is simply screwed onto the stand and the hs-15 is mounted onto to the top of the umbrella holder and can be used in combination with your existing flash unit/s. alternatively, the hs-15 can be mounted to the falcon eyes cld-15 tilting bracket allowing your flash set to be bent and positioned in almost any direction (as shown in photo 2).