The product is a fantastic live steam engine dynamo with a color changing LED accessory. The Compact dynamo, 1.7 x 1.8 x 2.2 inches, has a strong magnetic base which can be removed for permanent use as well and the multi color changing LED makes it a great accessory and adds an extra element of fun and interest to your live steam engine. Will work with many model steam engines but possibly not all, clockwise only, shown running on a Wilesco D16 in the last three pic's, not included, the listing is for the dynamo shown in first 3 pic's with drive band, last one.