It's a very cheap gadget designed to velcro onto your Canon or NIkon strobe which pumps up the light and is used for giving a long range subject some fill. Normally used for bird photography. I've been to the website in US and it costs $38 but they charge $50 to post the damn thing. Total cost around $90 for a $40 product.
I want to source one in Australia, surely they must be available but I don't know.