Nikon offers you TTL Marine (Underwater) Speedlight. This underwater flash unit features automatic through-the-lens (TTL) flash control, built-in flash slave function, camera slave function with the RS Signal light and test function. It provides depth capacity 328 ft (100m). The SB-105 is supplied with MS-5 battery holder, SS- 101, SW-103, 0-ring set, UW sync cord, mounting bracket set.