Rechargeable External Battery For Iphone4 Black

USB - Universal Serial Bus

iPhone - A popular smartphone manufactured by Apple

Black - A colour which does not emit any colour of the spectrum. Black absorbs all frequencies of the spectrum.

Ergonomic - A specific design to fit the purpose of the user

Battery - A device used for the storage of electricity

weight - A measure of the force applied on an object by gravity. Measured metric in grams and kilos or imperial in lbs and oz

Weight - a measurement of how heavy an object appears due to the pull of gravity. For example the weight of an object on planet earth will be different to the weight of the object on the moon

USB - Universal Serial Bus. A method of connecting a device to a computer

Shell - A hard external structure or surface.

Convenience - A way of being able to carry out a task with little effort

Rechargeable - Something that can be charged back to its original state, e.g. batteries.

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