If you're hoping to hook up a DSLR to a telescope this won't help though, not big enough. Plus, this style of tracker only tracks through one axis, limiting exposure time to ~10seconds before stuff gets blurry & drift destroys the image... but that's still better than the ~2seconds or so that you get without it.
You can build an arduino-powered "barn-door tracker" for ~$40 that will significantly help with this. https://www.youtube.com/watch?v=5hqXqqTtWzU
If you're hoping to hook up a DSLR to a telescope this won't help though, not big enough. Plus, this style of tracker only tracks through one axis, limiting exposure time to ~10seconds before stuff gets blurry & drift destroys the image... but that's still better than the ~2seconds or so that you get without it.