Control multiple flashes equipped with the YN-622C E-TTL transceiver with the YN-622C-TX E-TTL Wireless Flash Controller from Yongnuo. Compatible with Canon E-TTL / E-TTL II cameras, this controller slides directly into the hot shoe and utilizes a 2.4 GHz frequency with a range of 328' to trigger the remote flashes. The controller also has TTL, manual, and multi flash modes available for full creative control. Additionally, it can utilize 7 channels and 3 groups for setting up multiple flash units easily and efficiently The YN-622C-TX utilizes an LCD screen to display settings and allow users to make adjustments. On the device is also an AF assist beam to help in low-light conditions. Multiple sync modes are available for more specific needs or effects, including 1st and 2nd curtain sync. A high speed sync mode will help in bright lighting conditions and for stopping motion with a maximum speed of 1/8000 second. A built-in mini-USB port enables firmware updates to be installed, and the device runs on 2 AA batteries. Product Highlights: Compatible with Canon E-TTL / E-TTL II Frequency: 2.4 GHz Range: 328' TTL, Manual, and Multi Flash Modes Channels: 7 Groups: 3 LCD Screen AF Assist Beam High Speed, 1st and 2nd Curtain Sync USB Port for Firmware Updates Runs on 2 AA Batteries Specifications: Brand: Yongnuo Model Number: Yongnuo YN-622C-TX Frequency: 2.4 GHz Range: 328' ,100 m TTL Dedication: E-TTL / E-TTL II Channels: 7 Groups: 3 ,A, B, C Flash Modes: TTL, manual, multi Sync Mode: 1st curtain, 2nd curtain, high-speed sync Max Sync Speed: 1/8000 sec Interface: Triggering: Hot shoe, PC port Shutter Release: 2.5mm Firmware Upgrade: mini-USB Battery: 2 x AA battery Battery Life: Standby: 120 hours Dimensions: 3.5 x 2.1 x 1.5 ,9.0 x 5.3 x 3.9 cm Weight: 2.9 oz. ,82 g Package Includes: LS-2.5/C1 Shutter Connecting Cable LS-2.5/C3 Shutter Connecting Cable Limited 1-Year Warranty