Regulates flash sync voltage to 6 volts and protects your camera's circuitry! Over time, excessive flash synchronization voltage can lead to damage and costly repair; Safe-Sync offers a simple and effective way to protect your camera. No matter how high the original voltage, Safe-Sync reduces it to a safe 6 volts. Designed to be used in-line, with PC connections.
I have old Speedo packs, 2405 and 800 and trigger with Pocket Wizards. I either get intermittent triggering or none at all. This product rectifies that problem. I also sometimes use with my PCB monolights but it isn't as big a problem with those lights. So, bottom line is, it works, I'm happy and it's worth the $.
I bought this Safe-Sync to allow me to use an old righlight that has a high sync voltage on modern digital cameras. I checked the high sync voltage after it went through the safe-sync and it had been decreased to 6 volts as advertised.