Product Features High-Performance Hot Shoe Contacts for Reliable Information Transmission and Operation. Up to 5 groups, or 15 Individual Flashes can be Controlled via 1 Transmitter. Supports E-TTL II Flash, Manual Flash, Stroboscopic and Auto External Flash Metering. Dot Matrix LCD Panel displays all pertinent Information Simultaneously and Backlit Control Panel means Easy Operation. 8 Types of Custom Functions, 3 Types of Personal Functions. The Speedlite Transmitter ST-E3-RT (Ver.3) provides continued support of Canon DSLRs* that feature a standard hot shoe (not compatible with multi-function shoe equipped cameras). Many of the most popular features carry over to version 3, such as wireless rear curtain synchronization to capture ambient light trails and convey a sense of speed for moving subjects. An expansive minimum output range (down to 1/8192 power), and FE Memory as part of the radio transmitter so you can lock-in an E-TTL flash exposure level, even in complex multi-flash set-ups, and continue to use it for the same scene or subject. Radio controlled, two-way wireless transmission up to 98.4 ft., up to five groups or fifteen individual Speedlites, a dot matrix LCD with backlighting, intuitive controls and more. Product Information Product Dimensions 6.5 x 4.75 x 4.5 inches Item Weight 9.6 ounces ASIN B0CVQYLSH6 Item model number 6651C001 Customer Reviews Best Sellers Rank Date First Available February 15, 2024 Manufacturer Canon Country of Origin Japan