LEDs feem ntau siv nyob rau hauv lub tshuab tsis pom kev, uas yuav tsum tau ci thiab txawm illumination. Lub zeem muag tshuab yog ib lub tshuab uas kho vajtse thiab software ua hauj lwm ua ke los pab cov cav tov tshuaj xyuas, txheej txheem thiab qhia thiab ua teb.
Barcode scanners yog ib qho piv txwv ntawm daim ntawv thov kev pom lub tshuab - lawv nyeem barcodes, xa cov ntaub ntawv mus rau lub computer rau kev ua haujlwm. Cov khoom lag luam barcodes tso cai rau cov neeg ua haujlwm tshawb xyuas cov khoom sai sai rau cov nqi thiab cov ntaub ntawv. Barcodes tso cai rau tus nqi thiab cov ntaub ntawv cov khoom lag luam kom hloov kho hauv nruab nrab, tshem tawm qhov xav tau ntawm cov khoom lag luam tus nqi hloov tshiab.
