It appears to be either an 18-pin + 1 or a 19-pin extension cable. Video cable, monitor cable. Looks like it's made by Elecom. Since there's no packaging, I can't guarantee it, so please confirm for yourself. ⚠️ There might be errors in the description, so please purchase only if you understand the product from the images. Different lengths and 24-pin cables are also available. See here → #ChiruminCode I no longer need it, so I'll give it to someone who wants it. There might be dust that I couldn't remove, so please purchase only if you don't mind. Slightly twisted. Will be shipped with waterproof packaging and simple wrapping.