iPad charging plugs:

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The equipment listed below was not tested by Wall-Smart Ltd. Wall-Smart Ltd. does not vouch for the equipment quality,  performance or availability. 
RAVPower® RP-UA01 iPad USB Charging & Sync Adapter - Allows you to charge your iPad iPad 2 the new iPad with any computer or USB Hub
EZOWare® USB Express Charge for iPad, iPad mini, iPhone, iPod, and most Android smartphones Charger
XMultiple iPad USB Charging Adapter (by Xmultiple Technology, Inc.)
 PortaPow Fast Charge Adaptor (by Portapow)
uCharger Hi-Speed USB Charging Adaptor for iPhone 5S, 5C, 5, 4S, 4, 3GS & 3G, iPad 4, 3, 2 & 1, iPad Mini and more (by Plugable)
USB Charging/ Charger Adapter for Apple iPad 3/ iPAD 2/ iPad2/ iPad - Allows you to charge your iPad with any computer or USB hub