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Any device or appliance that has a useful specific practical purpose and function is called Gadget. Gadgets are sometimes also referred to as gizmos. In some circles the distinction between a gadget and a gizmo is that a gizmo has moving parts, whereas a gadget need not have them. For example, a digital watch would be a gadget, while an analog watch would be a gizmo. Thus a gizmo is essentially a mechanical gadget.
Electronic gadgets are based on transistors and integrated circuits. One needs a source of electric power to use electronic Gadgets. The most common electronic gadgets include transistor radio, television, cell phones etc.
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