Ask HN: What's the last cool gadget you bought?

I was just sharing my latest gadget buy, a bluetooth receiver for my car, (https://www.amazon.com/gp/product/B01EFPYQ2I/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1) with some coworkers and figured I'd ask the HN community to share yours.