This adapter by Delock can be used to block the transfer of data from devices with USB Type-A connection. The data lines are not connected, so that the adapter can only be used for charging. This means that a PC cannot access the data of e.g. a connected smartphone.

System requirements:
• PC or laptop with a free USB Type-A port

Specification:
• Connectors:
  1 x USB 3.0 Type-A male >
  1 x USB 3.0 Type-A female
• Output current: up to 900 mA
• Supports only charging function
• Data blocker
• Colour: black
• Dimensions (LxWxH): ca. 45 x 17 x 11 mm

Package content:
• Adapter

Data sheet:
http://www.delock.de/produkt/66497/pdf.html?sprache=en