Thanks to an introductory promotion that essentially made it free, Amazon’s Dash Wand became the fastest product to ever join our Bestseller club, meeting the 10,000 sale threshold in just two days.

The Dash Wand is a barcode scanner and Alexa-enabled device that lets you scan items around your home to automatically add them to your cart. It’s most useful for Amazon Fresh customers, but it’s inexpensive enough to appeal to Prime customers of all stripes.