Thank you for viewing! This item was at my grandfather's house, but he doesn't use it, so I'm selling it! It's a SIGMA strobe. I don't know the details of how to use it. If you're interested, please take a look! ▪️Product Name: Strobe ▪️Brand: SIGMA ▪️EF-500 DG ST E0-ETTL Ⅱ ▪️Accessories: Case Please refrain from purchasing if you are concerned about any points or are overly sensitive. *There may be items visible in the images that are not mentioned in the description, so please check the condition in the images and make your purchase after you are satisfied. S Y581