"The Strato II Multi by Phottix radio flash trigger.
I was photographing in Indiana Caverns when my flash fell 45 feet into a pit. It hit the pit wall about ninety times or about every six inches. It just wouldn't stop hitting and land on the bottom. To top it off it was an archeological site and it had to lay in the wet mud overnight until a trained person could get the flash. The Vivitar 283 was trashed but the radio trigger works just fine. The Strato has been on about twenty cave photo trips and has worked perfectly. It is one tough piece of gear."