This cord can be used to connect Canon flash units including the 299T, 199A, 177A, 155A and a few Toshiba and Mikona flash units, to a device requiring a standard male PC connector.
One common application is to connect the flash units listed above to an optical slave such as Item #0050 from FlashZebra.com.
Another common application would be to connect these flash units to the 4 channel V2, or V2s style of inexpensive radio slaves sold by Gadget Infinity, and other photographic merchants.
Price: $4.50 + shipping