SAFE SYNCS Safely reduces any electronic flash source from up to 400 volts to less than 6 volts to the camera sync input. This is absolutely mandatory for all high end and digital cameras.

Hot Shoe to Hot Shoe Safe Sync that also features professional heavy duty threaded PC high voltage input to 6 volts at the male hot shoe that the camera sees. Reduces redeye by raising shoe mounted strobe and also two can be used in tandem in effect for a high voltage input from pc or hotshoe to a low voltage pc if mounted on a camera bracket