The power of four,
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This review is from: PortaPow 2.5A Quad USB Wall Charger with 3 Year Guarantee (UK Plug) (Accessory)
Delighted with this little beauty.
Sleek and rather good looking (as much as a plug can be anyway) the real bonus is that all four USB sockets provide a full rate charge even when all in use.
I have been caught out by multi USB chargers before that, for example, will only charge a thirstier device like an iPad from one of the sockets. This four slot USB has happily fueled two iPads an iPhone and a Galaxy S IV without breaking a sweat.