Part of the ultra-versatile radio slave system, the Pocket Wizard Flex TT5 Transceiver is specifically to the Nikon i-TTL flash control system. Designed easily to mount onto the camera's hot shoe and supports single or multiple dedicated flash units. It performs as a transmitter or receiver when combined with another Flex TT5. Flex TT5 supports 1/500 seconds up to 1/8000 seconds (high-speed sync auto sync flash systems) flash sync speeds. The Flex TT5 is compatible with Nikon D Series cameras, Nikon SB-series speedlights, and Nikon SP- series speedlight and Nikon SU-800 on-camera master flashes.