Skimmer wands are semi-flexible data transfer wands that thieves can use to extract stolen ATM card data from deep-insert skimmers, wafer-thin fraud devices made to be hidden inside of the card acceptance slot on a cash machine. The wands appear to have a USB interface on one end (the end that plugs into whatever device the crooks use to download stolen card data) and a low profile header on the other. When possible, stick to ATMs that are physically installed at a bank.”]
Source: https://krebsonsecurity.com/2017/08/dumping-data-from-deep-insert-skimmers/