In the last two months, Amazon has spotlighted two new products that allow shoppers to add items to their shopping list without ever typing anything into a search bar. This isn’t a coincidence. The most recent one is Amazon Dash — a thin, wand-like device, revealed on Friday, that includes both a microphone and a barcode scanner. Speak into it or scan a box of cereal or pack of toilet paper to automatically add that product to your AmazonFresh shopping list. For now, it is available only on a trial basis to Amazon customers in San Francisco and Los Angeles who pay for Amazon’s new Prime Fresh membership, which includes grocery delivery. Before Dash, Amazon announced in February that it was adding a technology called Flow to its main shopping app on mobile phones.