Internal TTL circuitry and hot shoe for use with certain Ikelite housings for Panasonic mirrorless cameras, see Housing Compatibility below. Easy installation into the housing with a secure fit underneath the camera mounting tray.
Compatibility
200DL Housing for Panasonic Lumix GH5, GH5S # 71305
200DL Housing for Panasonic Lumix DC-G9 # 71307
Not compatible with any other models except as listed above
