'ZDNET Recommends': What exactly does it mean?ZDNET's recommendations are based on many hours of testing, research, and comparison shopping. How to stay protectedA USB condom is a small dongle that adds a layer of protection between your device and the charging point you're attaching it to. Sure, you could make one yourself from a USB cable (slice it up and cut the data cables), but with these bespoke data blockers costing only about $7, it really doesn't seem worth the hassle