Siv thiab faib cov ntawv hlau

Cov ntawv hlau tuaj yeem tiv thaiv hlau cuam tshuam thiab kev sib tsoo. Tsis yog-hlau- cov cim hluav taws xob tiv thaiv tsis tuaj yeem nyeem los ntawm cov neeg nyeem ntawv hluav taws xob thaum lawv ntsib hlau. Raws li kev faib cov zaus bands, cov cim hlau tuaj yeem muab faib ua: qis-frequency electronic tags, nruab nrab thiab siab-frequency electronic tags, ultra-high zaus thiab microwave electronic tags. Raws li cov yam ntxwv sib txawv ntawm daim ntawv thov thiab ib puag ncig siv, cov ntawv hlau hlau feem ntau siv cov ntawv ntim sib txawv. Cov ntawv ntim khoom feem ntau suav nrog: hom ntawv, hom ntawv lo thiab tshwj xeeb - hom zoo li. Daim ntawv ntim tuaj yeem ntim raws li cov neeg siv khoom xav tau.