Review on PortaPow USB Data Blocker (Black) - Secure Against Juice Jacking Safely by Andrew Spainhour

I have used this device several times to charge my phone in stores with public USB charging ports. It seems that juice jacking at public USB charging stations has been a problem for a number of years, but many people still don't know about it. A small, inexpensive adapter like this should probably be standard on every smartphone and tablet sold. This adapter basically just passes power for charging, but has no internal data ports, so it prevents people with nothing to do in their lives from stealing your data or downloading malware onto your device. The adapter is designed to perform a handshake between the charger and the phone's charging circuit to determine the battery type, charging speed, etc.