Check the listing for details. hahnel Tuff TTL Flash Trigger For Canon Cameras **OPEN BOX**. Condition: Open box. Listed at 134.75 USD. Condition Notes **OPEN BOX** Includes all Original Manufacturer Supplies Accessories Has Original Retail Packaging - but packaging shows signs of being open and may have wear. Excellent Condition - no signs of wear What's In the Box hahnel Tuff TTL Flash Trigger For Canon Cameras Transmitter Receiver Product Overview 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. Key Features 2.4 GHz Frequency Range: 656' Digital Channel Matching High Speed Sync Works with Flash Exposure Compensation Removable Silicone Casings Mini-USB Port for Power & Updates Each Unit Runs on 2 AA Batteries Receiver has 1/4"-20 Thread on Base