It is much smaller than it may appear in the photo, but it does its job. It fits correctly into the "classic" optical fiber cable (Toslink - square shape) and converts it to Mini-Toslink (3.5mm jack shape and size). CAUTION! Obviously, it does NOT convert the digital signal to analog or vice versa, it simply works for laptops that have both Mini-Toslink and classic 3.5mm jack audio output. It is excellent for these cases