HSHSB is Hot Shoe to Hot Shoe Safe Sync to Wein Products Inc in L.A., USA.
The range of innovative products from this company will astound you, but we are talking about the HSHSB; which I ordered four days ago from B&H Photo & Video in New York and I received it yesterday!
But first, for those that don't know... HSHSB SAFE SYNCS Safely reduces any electronic flash source with trigger voltage from
up to 400 volts to less than 6 volts to the camera sync input. This is
absolutely mandatory for all digital cameras, the high voltage will literally fried your chips ;)