This is a compact tracker perfect for astrophotography. I've kept it in a humidity-controlled warehouse, hoping to take night sky photos someday. Please, someone who will use it, buy it! As you can see in the images, the packaging is unopened, so I haven't been able to confirm its operation. Bonus book: I'll include a related book, although it's been cut. - Product Name: nano.tracker - Brand: SIGHTRON JAPAN - Function: Astrophotography tracker Thank you for looking.