Apple has shipped non-standard USB extension cables with some of their computers, for use with the included Apple USB keyboards. The extension cable's socket is keyed with a small protrusion to prevent the insertion of a standard USB plug, while the Apple USB keyboard's plug has a matching indentation. The indentation on the keyboard's plug does not interfere with insertion into a standard USB socket.[original research?]
Apple also uses a proprietary USB 30-pin dock connector on its iPods, iPhones, and the iPad.
HP Tablet computers use non-standard connectors to transmit the USB signals between the keyboard/mouse unit and the Computer Tablet Unit.
PDMI (Portable Digital Media Interface) is a 30-pin docking connector for portable devices standardized by ANSI/CEA which includes USB 3.0 "SuperSpeed" and USB 2.0 "High/Standard Speed" with USB-on-the-go, as well as DisplayPort, HDMI CEC, 5 V power, and analog audio.
Some digital cameras have their own USB connectors, like the Panasonic Lumix DMC-FT2.
The United States Army's Land Warrior system uses standard USB signaling with 15.6 V power using a ruggedized connector from Glenair, Inc.
The ExpressCard interface includes a USB2 port as well as the express bus port.
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