Works with multiple flash “red-eye reduction” cameras

Want to use an external flash unit with your new hi-res digital or film camera but it doesn’t have a trigger socket or “hot shoe”? Cheer up, this new slave flash trigger will let you do it and it will cope with those cameras which only work in multiple-flash “red-eye reduction” mode. You can build it for a fraction of the cost of similar “smart” trigger units, too.