Sea & Sea YS-60TTL/S Strobe Yellow with Built-In TTL Cord for Sea & Sea & Sea Arm IV Kit Built-in prism diffuser delivers a wide, even 105 x 95 beam pattern for full-frame coverage with even a 15mm lens Equipped with a fixed sync cord. The YS-60TTL-S dedicates to Sea &amp; Sea cameras and housings with a four-pin bulkhead connector. The YS-60TTL-N is equipped with a fixed five-pin sync connector for cameras and housings with a standard five-pin bulkhead. Built-in Duo circuitry permits it to dedicate with both four and five-pin connectors. A modest factory conversion is required. Exposure control: Manual (Full, 1/2) and TTL