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The hahnel Tuff TTL Wireless Flash Trigger for Canon Cameras is a wireless triggering system compatible with Canon E-TTL / E-TTL II metering. This radio system utilizes a 2.4 GHz frequency with a range of up to 656'. Also, it uses a Digital Channel Matching system to connect your transmitter and receivers reliably and easily.
The Tuff TTL system is compatible with High Speed Sync and second-curtain sync found on many DSLRs. Flash exposure compensation is supported as well and the devices have a removable silicone casing for durability.
The system can utilize Mini-USB ports for optional external power or for updating the firmware of the devices and they run on 2 AA batteries each. The receiver has a standard 1/4"-20 thread on the base for mounting.