Product Description: The PocketWizard Flex TT5 and AC3 combo is a versatile wireless flash triggering system designed for professional photographers seeking reliable and precise off-camera flash control. The Flex TT5 transceiver, when combined with the AC3 ZoneController, provides advanced features for controlling multiple remote flashes effortlessly. Key Features: Wireless Flash Triggering: The PocketWizard Flex TT5 allows photographers to trigger off-camera flashes wirelessly, providing freedom and flexibility in lighting setups. TTL Flash Control: With TTL (Through-The-Lens) flash control capability, the Flex TT5 enables automatic flash exposure adjustment for compatible TTL flashes, ensuring accurate and consistent exposure in various shooting conditions. HyperSync Technology: PocketWizard's HyperSync technology allows photographers to achieve faster sync speeds beyond the camera's X-sync limitations, enabling high-speed flash synchronization for action photography. ZoneControl with AC3: The AC3 ZoneController offers intuitive control over multiple remote flashes, allowing photographers to adjust flash power levels and ratios for up to three independent flash zones directly from the camera's position. Compatibility: The PocketWizard Flex TT5 and AC3 combo is compatible with a wide range of camera and flash models, providing versatile wireless flash control solutions for different photography setups. Reliability: Built with robust construction and advanced radio frequency technology, PocketWizard transceivers offer reliable performance and consistent signal transmission, even in challenging shooting environments. Expandability: The PocketWizard system is expandable, allowing photographers to integrate additional Flex TT5 units and accessories for more complex lighting setups and creative possibilities. Condition: Used What's Included: PocketWizard Flex TT5 Transceiver PocketWizard AC3 ZoneController