Initially bought this to safely trigger an old Vivitar 283 - which has a trigger voltage of 250v! Works perfectly. I've been experimenting with high-speed photography (water splashes etc) and when I tried the Hama Slave Unit in parallel with other flashes (fired by a wireless sound trigger)it showed no visible latency. A BB pellet inevitably shows slight blurring with commercial flash speeds, but when this slave was added the increase in 'blur' was almost nil. Very impressive - if one of my three radio triggers fails, I will replace it with another one of these at half the price of the cheapest wireless unit.