Features: --Supports ETTL Flash Supports FEC, FEB, Front and Rear-curtain sync, FE lock, Modeling Light, support for Canon camera menu accessible. --Double-Tube Macro Flash Supports flash ratio adjustment, there are 8 levels (1/128-1/1) for the intensity adjustment for the flash control, total 22 levels fine tuning; the tube A and tube B can flash individually, the flash index is wider and more practical. --The Flash Tube Installation Install the tube on the top of the flash; Install the adapter ring on the front of the lens,then install the flash tube on the adapter ring. --The Flash Coverage Vertical angle: Upwards,downwards 90 degrees; Horizontal angle: inwards 60 degrees,outwards 30 degrees; The rotate degree of the adapter ring: upwards 50 degrees, downwards 30 degrees; The flash tube can be installed on the tripod for use. --Ultra-fast Charging Recycle System It just take 3 seconds at full output. Even if not using the brand new batteries, it just takes 4~5 seconds to recycle. --C.Fn Setting Custom Function You can customize the function as needed through the custom function. --LED Focus Assist Light The LED focus assist light is divided into low light and highlight mode,achieve rapid precise focus. --Equipped with PC Sync Interface The YN24EX is equipped with standard PC synchronous interface which allows you convenient to use synchronous flash by using PC synchronous line. --Supports the Lens of Multiple Filter Size Supports the lens of the following filter size: 52mm, 58mm, 62mm, 67mm. --Low Battery Remind Function When the battery power is insufficient,the red light will blink which remind you to replace the battery timely. --Sound prompt system When the sound prompt system is enabled, different sound modes will prompt different working conditions of the speedlite so as to allow you to focus on shooting process (Note: the sound can be turned off). --Equipped with the External Power Socket YN-24EX is provided with external power socket to meet your higher demand of recycling time and no longer missing the wonderful moments. --Automatic Settings Saving YN-24EX can automatically save your current operating settings to convenient your next use. Compaible Cameras: For Canon 1Dx, 1Ds series, 1D series, 5DIII, 5DII, 7DII 5D, 6D, 7D, 80D, 70D, 60D, 50D, 40D, 30D, 20D, 750D 700D, 650D/T4i, 600D/T3i, 550D/T2i, 500D/T1i, 450D/Xsi, 400D/Xti, 350D, 100D, 1100D, 1000D, 1200D.