Zkong ESLs tshiab yog wireless, uas txhais tau hais tias lawv tuaj yeem tswj tau los ntawm thaj chaw deb thiab hloov kho tshiab, tshem tawm qhov xav tau ntawm phau ntawv hloov pauv thiab txo qhov kev pheej hmoo ntawm kev ua yuam kev. Cov thev naus laus zis no tseem tso cai rau cov khw muag khoom hloov pauv tam sim rau tus nqi, xws li thaum lub sijhawm muag lossis kev tshaj tawm, muab ntau dua ...
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