Now that the holiday season is ending, Amazon.com has released a report on what tech products sold best on the mega-retailer’s online store. Not surprisingly, Amazon says a number of its own products, including the Echo, Echo Dot, and others, performed well. But this year’s bestsellers also included several smart home devices, a few wearables and some basic mobile accessories and data storage devices. In a statement two days after Christmas, Amazon used some unique facts and figures to illustrate sales volume for some products. For example the company said that its customers bought enough 4K TVs to reach Mount Everest’s peak—nine times.