The item arrived loosely packed, one of the adapters was bent and power chord was missing. It's almost like this item was used by someone else, returned and then resold. who knows.The instructions did not even mention how to use it with the Celestron telescope that part you have to figure out on your own. I've bought the NexStar 8, the set of extra filters and lenses and this power pack. I don't know why but Celstron documentation on all three products is erroneous or just lacking. The telescope info was inaccurate and had outdated info from an older manual and the filters and tank had minimal info. It's almost like they were too cheap to spend the money on hiring someone to create useful documentation.They are very slow to respond to repsond to phone or email requests for support. Do yourself a favor and do not buy Celestron products there are plenty of other qualified makers of this type of product.