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A gadget is a small technological object of certain function, but is often considered as a original and unusual novelty. Gadgets are cleverly designed than normal technological objects at the time of their invention. The following demands are submitted to gadgets: portability - the weight typical gadget does not exceed 300 gram, and the sizes allow them to fit into pockets; functionality- gadget besides expected functions (for example, indication of time for hours), contains any set of additional functions (at clock the radio receiver, a microcomputer, a player, etc. can be built in); the limited possibilities. The majority of gadgets do not allow increasing functionality by joining of additional modules. Also gadgets are frequently completed with insufficiently capacious accumulators. Unusual keyboards, mousses, fancy players, joysticks, headphones, iPod, Smartphone, etc are examples of gadgets.