AC Power Adaptor Plug with Dual Port USB. Power Rating 2.1 AMP for Quick Charging. For use with Cell Phones, Tablets and more. Over Current and Voltage Protection. Modifies the following grounded appliance plugs to fit electrical outlets in Great Britain and Hong Kong.

Do I need a grounded adaptor? If your North American appliance plug has two flat blades and one round pin, your appliance is grounded. 

NOTE: Some countries use more than one type of outlet and you should carry the appropriate adaptor for each outlet listed.

IMPORTANT: Adaptor plugs DO NOT convert electricity; they simply modify foreign outlets. If your grounded appliance is multivoltage (120/240 or 100-240 volts) you only need a grounded adaptor plug. If the appliance is 120 volts only you need a grounded transformer to convert the voltage and a grounded adaptor plug to modify the outlet.