The PocketWizard Flex TT6 Radio Transceiver allows you to use the Canon E-TTL flash system remotely. This transceiver offers compatibility with most PocketWizard radio flashes. It can be operated from 800 ft with TTL and from 1200 ft with a regular trigger. The transceiver can also be used as an on-camera master or as a remote slave. It has a hot shoe for attaching a flash, both on camera or when using it individually. This transceiver has auto-sensing technology that helps it switch between the roles of a transmitter and receiver automatically. The transceiver is controlled via ControlTL that works with most Canon E-TTL and E-TTL II systems. It can also be manually operated for up to three zones. The transceiver's HyperSync technology offers fast sync speeds without the need of a TTL. Two AA batteries power this transceiver and provide functionality for 60 hours.