Njikwa anya bụ ihe na-ebufe ikuku, site na teknụzụ nzuzo dijitalụ ọgbara ọhụrụ, etinyere ozi isi, site na infrared diode na-ebunye ebili mmiri ọkụ, ebili mmiri ọkụ site na nnata infrared nke nnata ga-enweta ozi infrared n'ime ozi eletriki, n'ime usoro...
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