Internal TTL circuitry and hot shoe for use with certain Ikelite housings for Canon DSLR cameras, see Housing Compatibility below. Easy installation into the housing with a secure fit underneath the camera mounting tray. 

Housing compatibility

• DL200 Housing for Canon 5D Mark III, IV, 5DS(R) # 71702
• DL50 Housing for Canon 5D Mark III, IV, 5DS(R) # 73702
• FL200 Housing for Canon 5D Mark III, IV, 5DS(R) # 6871.09

Not compatible with any other models except as listed above

Not compatible with non-Ikelite housings

• Hotshoe with connector