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WLS-PVC Card
WALLIS
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Wallis tsim kev cai 13.56MHz contactless smart NFC PVC phaib rau kev tswj xyuas, kev koom ua tswv cuab, tsev so, tsev kawm ntawv, cov xwm txheej, cov kev pabcuam ncaj ncees, kev thauj mus los, kev txheeb xyuas, NFC kev lag luam thiab lwm cov phiaj xwm ntse. Txhua daim npav sib xyaw ua ke xaiv 13.56MHz nti thiab tuned kav hlau txais xov nrog lub cev daim npav PVC ruaj khov.
Cov neeg yuav khoom tuaj yeem kho cov nti, daim npav loj, kos duab, luam ntawv, nto tiav, UID lossis serial-number printing, QR codes, barcodes thiab xaiv cov ntaub ntawv encoding. Daim npav zaum kawg yuav tsum tau ua kom haum rau tus nyeem ntawv raws tu qauv, kev xav tau kev nco, qib kev ruaj ntseg, kev sib raug zoo ntawm smartphone thiab daim ntawv thov software.
Lub sij hawm '13.56MHz' txheeb xyuas qhov kev khiav hauj lwm zaus tab sis tsis txhais ib tug universal smart-card standard. NTAG, MIFARE, DESFire thiab ICODE cov khoom lag luam muaj cov txheej txheem sib txawv, cov qauv cim xeeb, cov lus txib thiab muaj peev xwm ruaj ntseg thiab yuav tsum tsis txhob raug kho raws li kev hloov pauv.
Thov ib daim 13.56MHz NFC Daim Ntawv Tso Cai
| Khoom | Kev cai 13.56MHz Contactless Ntse NFC PVC Card | Qauv | WLS-PVC Card |
| Khoom siv | PVC | Ntau zaus | 13.56MHz HF/NFC |
| Daim npav loj | 86 × 54 mm xaiv; customized qhov ntev tuaj yeem sib tham | Daim npav Thickness | Qhov project tshwj xeeb; paub meej raws li kev nyeem ntawv, tshuab luam ntawv thiab daim npav tsim |
| Kev luam ntawv | Inkjet lossis Indigo luam ntawv; ntxiv cov txheej txheem ntau lawm tuaj yeem tshuaj xyuas | Xim | Customized front-and-back artwork thiab hom xim |
| Chip Options | NTAG, MIFARE, DESFire, ICODE thiab lwm yam kev xaiv 13.56MHz tau txais kev pom zoo | raws tu qauv | ISO / IEC 14443 Hom A, ISO / IEC 15693 lossis lwm cov txheej txheem tshwj xeeb nti |
| Kev kho tus kheej | UID, serial tooj, npe, duab, QR codes, barcodes thiab lwm yam ntaub ntawv sib txawv | Encoding | Kev xaiv NDEF lossis cov ntaub ntawv tshwj xeeb tshwj xeeb sau ntawv raws li nti, cov yuam sij thiab pom zoo daim ntawv qhia nco |
| Nto xaiv | Glossy, matte lossis lwm yam tiav tiav | Nta ntxiv | Sib nqus stripe, kos npe vaj huam sib luag, qhov xuas nrig ntaus, UV luam ntawv lossis holographic tiav los ntawm qhov project |
| Cov ntawv thov tseem ceeb | Kev nkag mus, tsev so, kev ua tswv cuab, kev ncaj ncees, kev tshwm sim, tsev kawm ntawv, NFC kev lag luam thiab cov kev pab cuam tus kheej | Kev them nyiaj yug OEM | Chip xaiv, luam ntawv, encoding, qauv pom zoo, tshuaj xyuas thiab export ntim |
Daim npav WLS-PVC txhawb nqa 86 × 54 mm hom, Inkjet lossis Indigo luam ntawv, cov xim customized thiab daim npav PVC lub cev. Cov tuab tuab, nti, raws tu qauv, nco, nyeem ntau yam, kev ua haujlwm kub thiab kev ruaj ntseg yuav tsum tau lees paub rau txhua qhov haujlwm.
Daim npav ntse tsis muaj kev tiv thaiv muaj ib qho kev sib txuas txuas nrog lub kav hlau txais xov hauv PVC daim npav lub cev. Tus nyeem ntawv muab lub zog los ntawm lub xov tooj cua zaus, tso cai rau daim npav thiab tus nyeem ntawv pauv cov lus txib thiab cov ntaub ntawv yam tsis muaj hluav taws xob tiv tauj lub cev.
Feem ntau cov ntawv tsis sib tiv tauj PVC yog passive thiab tau txais lub zog ua haujlwm los ntawm kev nyeem ntawv. Daim npav tsis xav tau lub roj teeb sab hauv rau kev sib txuas lus ib txwm.
Qhov kev nyeem ntawv tiag tiag nyob ntawm lub nti, kav hlau txais xov geometry, daim npav tsim, lub zog nyeem ntawv, tus nyeem ntawv kav hlau txais xov, cov ntaub ntawv nyob ze thiab daim npav taw qhia. Qhov kev ncua deb yuav tsum tsis txhob lav yam tsis tau kuaj daim npav tiav nrog tus nyeem ntawv npaj.
Hloov cov nti, kav hlau txais xov, daim npav tuab lossis cov khoom nyob ze tuaj yeem cuam tshuam rau kev ua haujlwm thiab kev nyeem ntawv. Kev tsim kho chip-thiab-antenna pom zoo yuav tsum tau kuaj tom qab luam ntawv, lamination thiab daim npav tiav.
NFC ua haujlwm ntawm 13.56MHz, tab sis tsis yog txhua 13.56MHz HF RFID daim npav muaj tib lub xov tooj sib cuam tshuam lossis NFC Rooj Sib Tham tus cwj pwm. Compatibility nyob ntawm qhov tseeb nti thiab raws tu qauv.
| Chip Family | Protocol Positioning | Hom Project Fit | Cov Lus Cim Xaiv Tseem Ceeb |
|---|---|---|---|
| NTAG 213/215/216 | NFC Rooj Sib Tham Hom 2 thiab ISO / IEC 14443 Hom A | NFC daim npav lag luam, kev sib txuas lub vev xaib, cov duab digital, kev txheeb xyuas qhov tseeb thiab kev koom tes hauv xov tooj | Cov neeg siv nco txawv ntawm tus qauv; paub meej tias NDEF qhov loj me, lo lus zais, ntsuas phoo thiab qhov xav tau qub |
| MIFARE Ultralight | ISO/IEC 14443 Hom A ib puag ncig | Cov xwm txheej, txwv tsis pub siv daim pib, loyalty thiab xaiv cov kev qhia txog tus kheej | Paub meej meej tiam, nco, lo lus zais thiab originality nta |
| MIFARE Classic | ISO/IEC 14443 Hom A legacy ecosystem | Kev nkag mus uas twb muaj lawm, kev ua tswv cuab, tsev so, daim pib lossis cov kev hloov pauv-nyeem ntawv | Siv qhov chaw nruab qhov system xav tau nws; ntsuam xyuas ib qho kev ruaj ntseg rau cov qauv kev ruaj ntseg tshiab |
| MIFARE DESFIRE | ISO / IEC 14443 Hom A nrog kev ruaj ntseg dua-txheej daim ntawv thov | Kev nyab xeeb nkag mus, tsev kawm ntawv, kev thauj mus los, tus kheej thiab ntau daim ntawv thov kev pab cuam | Yuav tsum muaj daim ntawv thov tsim, kev tswj xyuas qhov tseem ceeb, kev ua tus kheej thiab kev sib koom ua ke ntawm kev nyeem ntawv / software |
| ICODE / ISO 15693 Daim Ntawv Pov Thawj | ISO / IEC 15693 thiab NFC Lub Rooj Sib Tham Hom 5 qhov chaw | Cov tsev qiv ntawv, khoom vaj khoom tsev, kev txheeb xyuas thiab thaj chaw-daim ntawv thov | Tsis hloov pauv nrog ISO / IEC 14443 nyeem ntawv; paub meej tias raws tu qauv thiab kav hlau txais xov tsim |
Ob daim npav tuaj yeem ua haujlwm ntawm 13.56MHz thaum siv cov qauv sib txawv, cov lus txib thiab daim ntawv thov txheej. Muab tus qauv nyeem ntawv, daim npav tam sim no, raws tu qauv lossis xav tau nti ua ntej pom zoo ib daim npav hloov.
Qhov URL luv luv tuaj yeem haum rau hauv NFC lub cim xeeb me me, thaum lub ntsej muag digital loj dua, ntau cov ntaub ntawv NDEF lossis daim ntawv thov kev ruaj ntseg yuav xav tau ntau lub peev xwm. Cov ntsiab lus encoding yuav tsum tau ua tiav ua ntej xaiv lub nti.
Kev tiv thaiv tus password yooj yim, kev kaw mus tas li, cryptographic kev txheeb xyuas qhov tseeb thiab kev ruaj ntseg ntau daim ntawv thov kev txhawb nqa muaj peev xwm sib txawv. Cov nti, nyeem ntawv, yuam sij, software thiab backend yuav tsum tau tsim ua ke.
Rau cov kev pabcuam rov muaj dua, cov neeg yuav khoom yuav tsum paub meej tias cov chaw tsim khoom muaj pes tsawg tus lej, kev pom zoo lwm txoj hauv kev, muab kev txuas ntxiv, UID hom thiab kev hloov-tswj yuav tsum ua ua ntej yuav mus ntev.
NFC Forum-compatible chips xws li NTAG21x yog feem ntau xaiv thaum cov neeg siv yuav tsum tau coj mus rhaub ib daim npav nrog lub xov tooj los qhib URL, nplooj ntawv tiv tauj, daim npav lag luam digital, cov ntaub ntawv cov khoom lossis nplooj ntawv phiaj xwm tsaws.
NFC daim npav sib xws tuaj yeem khaws NDEF cov ntaub ntawv xws li URLs, ntawv nyeem lossis cov ntaub ntawv tiv tauj. Cov ntaub ntawv loj, hom ntaub ntawv, redirect lub tswv yim, lo lus zais chaw thiab yav tom ntej kho yuav tsum tau lees paub ua ntej encoding.
Lub nti sib xws tsis lav tus cwj pwm zoo ib yam ntawm txhua lub xov tooj smartphone. Xov tooj kho vajtse, kav hlau txais xov qhov chaw, kev khiav hauj lwm qhov system, daim ntawv tso cai daim ntawv tso cai thiab daim ntawv tso cai yuav cuam tshuam rau cov neeg siv.
Xaiv NFC chips txhawb kev tiv thaiv tus password thiab kev nyeem ntawv nkaus xwb. Kev kaw ruaj khov yuav tsum tau siv tsuas yog tom qab qhov tseeb cov ntaub ntawv pov thawj vim tias kev ua haujlwm yuav tsis thim rov qab.
Rau kev lag luam thiab digital-profile cards, encoding ib tug tswj redirect URL tuaj yeem ua rau qhov chaw hloov tshiab yooj yim dua yam tsis tau sau txhua daim npav. Lub redirect platform thiab domain security tseem yog ib feem ntawm tus neeg yuav khoom lub digital system.
Daim npav tuaj yeem tso cov logos, cov xim sib txawv, cov duab, cov lus qhia, cov ntaub ntawv tiv tauj thiab cov duab kos npe. Editable AI, EPS lossis PDF artwork raug pom zoo rau kev tsim lub logo ntse.
Tsau artwork tshwm nyob rau hauv txhua daim npav, thaum cov chaw sib txawv tuaj yeem suav nrog cov npe, tus neeg ua haujlwm ID, tus lej tswv cuab, duab, hnub tas sij hawm, QR codes, barcodes lossis chip UIDs.
Thaum tus lej luam tawm yuav tsum phim cov ntaub ntawv hluav taws xob UID lossis cov ntaub ntawv encoded, txhais cov hom hexadecimal lossis decimal format, byte order, coj xoom, cais thiab daim npav sib lawv liag ua ntej ntau lawm.
Nyob ntawm daim npav kev tsim kho, cov kev xaiv tuaj yeem suav nrog glossy lossis matte nto, sib nqus kab txaij, kos npe panels, qhov, kub stamping, UV luam ntawv, holographic ntsiab thiab lwm yam kev ruaj ntseg lossis cov cim npe.
Muab cov duab kos duab pem hauv ntej thiab nram qab nrog cov ntshav thiab cov chaw nyab xeeb. Cov ntaub ntawv sib txawv yuav tsum tau muab tso rau hauv daim ntawv cog lus pom zoo nrog ib kab ib daim npav thiab cov kab ntawv kom meej meej.
Cov ntawv tsis sib cuag PVC tuaj yeem txheeb xyuas cov neeg ua haujlwm, cov neeg cog lus thiab cov neeg tuaj saib thaum xaiv cov nti thiab cov ntawv pov thawj uas tau lees paub yog sib xws nrog cov txheej txheem nkag.
Cov ntawv teev npe tsev so yuav tsum phim lub kaw-system hom, encoder, nti thiab kev tswj hwm vaj tse. Ib qho qauv ntawm lub cev yuav tsum tau sim ntawm qhov ntsuas qhov tseeb ua ntej ntau lawm.
Cov khw muag khoom, cov koom haum, gyms thiab cov chaw muab kev pabcuam tuaj yeem siv daim npav tshwj xeeb rau kev txheeb xyuas cov tswvcuab, kos-hauv, khoom plig lossis txuas rau cov duab digital.
Cov tsev kawm ntawv thiab cov tsev kawm ntawv tuaj yeem sib koom ua ke kev txheeb xyuas, tsev qiv ntawv, kev tuaj koom thiab chaw ua haujlwm thaum lub platform xaiv ntse-card txhawb nqa lawv cov nyeem thiab software.
Daim pib thiab kev thauj mus los yuav siv tau 13.56MHz technology, tab sis lawv feem ntau xav tau cov chips tshwj xeeb, kev sib pauv ceev, kev ruaj ntseg, ntawv pov thawj thiab cov txheej txheem ntawm tus kheej.
NFC-enabled cards tuaj yeem txuas cov neeg siv los tiv tauj cov ntsiab lus, social profiles, nplooj ntawv khoom, ntawv qhia zaub mov, kev tshaj tawm lossis lwm cov ntsiab lus digital tswj tau siv cov smartphones sib xws.
Daim npav ntse tuaj yeem txhawb nqa cov neeg mob lossis cov neeg ua haujlwm txheeb xyuas cov haujlwm, tab sis cov ntaub ntawv kho mob rhiab heev yuav tsum raug tiv thaiv los ntawm kev tswj xyuas kev nkag mus tau zoo, encryption, cov cai ntiag tug thiab cov ntaub ntawv rov qab tsis yog khaws cia.
Daim npav 13.56MHz PVC tsis tau txais daim npav them nyiaj hauv tuam txhab. Kev them nqi, kev thauj mus los thiab cov kev pabcuam khaws cia yuav tsum muaj kev pom zoo ruaj ntseg nti, cov ntawv pov thawj cov ntawv pov thawj, kev tswj xyuas qhov tseem ceeb, kev sib koom ua ke software thiab kev tso cai hauv lub system.
Daim npav tuaj yeem sib tham ua daim npav tsis muaj kev tiv thaiv rau cov neeg siv khoom-sab encoding lossis ua daim npav pre-encoded siv cov ntaub ntawv pom zoo. Lub nti, daim ntawv qhia nco, yuam sij, passwords, xauv xwm txheej thiab cov txheej txheem pov thawj yuav tsum tau teev tseg.
Kev ruaj ntseg daim ntawv thov daim npav ntse yuav tsum tau tswj xyuas qhov tseem ceeb tsim, hloov pauv, sib txawv, khaws cia thiab kev sib hloov. Kev muab cov nti ruaj ntseg yam tsis muaj txheej txheem tswj xyuas qhov tseem ceeb tsis tsim kom muaj kev ruaj ntseg daim ntawv pov thawj.
Qee cov tsev neeg chip muab cov cim kos npe los yog kev txheeb xyuas qhov tseeb. Cov haujlwm no yuav tsum raug lees paub siv cov chaw tsim khoom cov ntaub ntawv txheej txheem thiab muab tso rau hauv cov ntaub ntawv pov thawj backend.
Khaws cov ntaub ntawv tsuas yog xav tau los ntawm daim ntawv thov. Cov ntaub ntawv tseem ceeb ntawm tus kheej yuav tsum raug tiv thaiv los ntawm kev nkag mus rau cov cai thiab cov txheej txheem rov qab es tsis yog sau raws li cov ntsiab lus tsis muaj kev tiv thaiv.
Cov npav encoded yuav tsum tau nyeem rov qab thiab muab piv nrog cov ntaub ntawv pom zoo. Rau kev txiav txim tus kheej, cov lej luam tawm, QR cov lej thiab cov ntaub ntawv hluav taws xob yuav tsum nyob twj ywm kom raug.
Daim ntawv thov thiab daim npav xav tau
Cov qauv chip tiag los yog xav tau raws tu qauv
Nyeem ntawv, encoder, smartphone lossis tsev so-lock qauv
Nco, nyeem / sau, kev ruaj ntseg thiab kev tswj hwm qhov tseem ceeb
Daim npav loj, thickness, nto thiab ntau
Pem hauv ntej thiab nram qab artwork nrog los ntshav
Tsau thiab hloov pauv cov ntawv luam tawm
Encoding cov ntaub ntawv, NDEF cov ntaub ntawv, passwords, yuam sij thiab ntsuas phoo
Sib nqus stripe, kos npe vaj huam sib luag, qhov los yog kev ruaj ntseg-tiav cov cai
Sample kom muaj nuj nqis, ntim, xa mus rau qhov chaw thiab lub sijhawm
Xa koj Chip thiab nyeem ntawv xav tau
Wallis tshuaj xyuas cov nti, raws tu qauv, kav hlau txais xov, nyeem ntawv, software, daim npav loj, luam ntawv, encoding thiab ua tiav cov cai ua ntej lees paub cov lus hais thiab cov qauv specification.
Cov ntaub ntawv pov thawj yuav tsum paub meej pem hauv ntej-thiab-rov qab artwork, qhov ntev, los ntshav, qhov chaw sib txawv-cov ntaub ntawv, cov ntaub ntawv luam tawm ntsig txog nti thiab cov haujlwm tshwj xeeb.
Cov neeg yuav khoom yuav tsum sim luam ntawv, qhov ntev, qhov zoo ntawm qhov chaw, kev sib raug zoo ntawm tus nyeem ntawv, kev sib cuam tshuam ntawm smartphone, nyeem ntau yam, encoding thiab ntsuas phoo siv cov khoom siv thiab software.
Kev tshuaj xyuas tuaj yeem suav nrog qhov pom, qhov ntev, qhov tiaj tus, nti nyeem tau, UID, cov ntaub ntawv nkag, luam tawm thiab sib piv ntawm cov ntaub ntawv luam tawm thiab hluav taws xob.
Sequential phaib tuaj yeem ntim tau los ntawm kev tswj cov ntaub ntawv ntau. Lub thawv ntawv, daim npav kom muaj nuj nqis, kev txiav txim ib ntus thiab cov ntaub ntawv tshuaj xyuas yuav tsum ua raws li qhov kev pom zoo xav tau.
Wallis txhawb nqa cov qauv kev tsim kho thiab OEM ntau lawm rau cov neeg xa khoom, kev sib koom ua ke, cov tuam txhab kev ruaj ntseg, tsev so, cov kev pabcuam tswvcuab thiab pab pawg ua haujlwm.
Cov nti, kav hlau txais xov thiab PVC txheej yuav tsum tau ua tiav raws li daim ntawv tso cai tsim kom muaj kev tiaj tus, nto zoo thiab tsis muaj kev sib cuag.
Daim npav tiav tuaj yeem raug soj ntsuam rau qhov pom kev zoo, qhov ntev thiab tsis muaj kev nyeem ntawv raws li kev soj ntsuam xyuas tshwj xeeb.
Cov duab hauv qab no yog muab raws li cov khoom siv PVC dav siv. Cov lus qhia tshwj xeeb ntawm daim npav ntse yuav tsum tau lees paub siv cov nti xaiv, kav hlau txais xov, daim npav tsim thiab cov qauv tsim tau pom zoo.
Cov ntawv tsis sib cuag yuav tsum tau ntim kom tsis txhob khawb, khoov, ya raws thiab tsis muaj zog thaum thauj. Kev txiav txim tus kheej los yog ua ntu zus tuaj yeem sau npe los ntawm daim npav ntau, lub thawv naj npawb thiab ntim ntim.
Wallis tuaj yeem tshuaj xyuas tus nyeem ntawv, raws tu qauv, nco, kev ruaj ntseg thiab smartphone xav tau ua ntej lees paub qhov tsim nyog daim npav.
Cov neeg yuav khoom tuaj yeem muab cov kev cai kos duab, cov ntaub ntawv sib txawv, UID luam ntawv, QR cov lej, barcodes thiab xaiv nti encoding hauv ib qhov project workflow.
Ib qho piv txwv ntawm lub cev pab kom paub meej tias daim npav zoo li, kev nyeem ntawv sib raug zoo, kev ua haujlwm ntawm lub xov tooj smartphone thiab cov ntaub ntawv encoded ua ntej qhov kev txiav txim ntau raug tso tawm.
Wallis txhawb nqa daim npav distributors, nkag mus-tswj kev koom ua ke, tsev so, tsev kawm ntawv, khw muag khoom, tus tswv lag luam thiab lwm lub koom haum uas xav tau daim npav ntse tsis sib cuag.
Pib koj qhov kev cai NFC Card Project
Nws yog lub xov tooj cua ua haujlwm zaus. Nws tsis txheeb xyuas qhov tseeb raws tu qauv, nco lossis qib kev ruaj ntseg, yog li cov nti thiab cov ntawv nyeem yuav tsum tau lees paub.
TS EN ISO / IEC 14443 Hom A, Hom B, ISO / IEC 15693 thiab NFC Lub Rooj Sib Tham Chip cov tsev neeg tuaj yeem siv 13.56MHz tab sis tsis tuaj yeem hloov pauv.
NTAG 213, NTAG 215 or NTAG 216 is common options. Xaiv tus qauv raws li NDEF cov ntaub ntawv loj, lo lus zais yuav tsum tau, xov tooj sib raug zoo thiab kev npaj kho rau yav tom ntej.
Lub platform ruaj ntseg xws li cov khoom siv DESFire sib xws yuav tsim nyog, tab sis tus nyeem ntawv, cov yuam sij, cov ntaub ntawv thov, software thiab backend yuav tsum tau tsim rau cov nti.
Nws muaj peev xwm thaum xaiv nti thiab cov ntaub ntawv hom tau txais kev txhawb nqa los ntawm lub xov tooj. Ntsuam xyuas daim npav nrog tus neeg sawv cev ntawm cov qauv xov tooj thiab cov tshuab ua haujlwm ua ntej ntau lawm.
Tau tshaj NFC daim npav tuaj yeem nkag nrog NDEF URL. Muab qhov kawg URL, redirect yuav tsum tau, lo lus zais los yog xauv qhov chaw thiab pov thawj txoj kev.
Xaiv cov chips txhawb kev nyeem ntawv nkaus xwb xauv. Siv cov xauv ruaj ruaj tsuas yog tom qab qhov kev kuaj xyuas zaum kawg vim tias kev ua haujlwm yuav tsis thim rov qab.
Daim npav generic NFC PVC tsis tau txais kev them nyiaj-ntawv pov thawj. Kev them nyiaj ruaj ntseg yuav tsum muaj daim ntawv pov thawj, cov ntawv pov thawj, cov yuam sij tswj, kev sib koom ua ke software thiab kev tso cai los ntawm kev them nyiaj lossis kaw lub voj.
Yog lawm. Cov npe, lej, QR cov lej, barcodes thiab cov ntaub ntawv hluav taws xob sib xws tuaj yeem tsim los ntawm cov ntaub ntawv pom zoo nrog ib kab rau ib daim npav.
Kev nyeem ntawv nrug nyob ntawm tus nti, kav hlau txais xov, nyeem ntawv, daim npav tsim, ib puag ncig thiab kev taw qhia. Ntsuam xyuas daim npav tiav nrog tus nyeem ntawv npaj es tsis tso siab rau qhov kev ncua deb.
PVC phaib tuaj yeem muab kev tiv thaiv zoo rau cov dej noo ntau. Kev tiv thaiv tiag tiag nyob ntawm daim npav siv, lamination, ntug zoo thiab raug mob, yog li tshwj xeeb ib puag ncig yuav tsum tau lees paub.
Ib qho piv txwv tau pom zoo rau kev lees paub kev kos duab, qhov ntev, kev sib raug zoo ntawm tus nyeem ntawv, kev sib cuam tshuam ntawm smartphone, nyeem ntau yam, encoding thiab kev ruaj ntseg.
Xa daim ntawv thov, nti lossis raws tu qauv, tus qauv nyeem ntawv, kom muaj nuj nqis, daim npav loj, daim duab kos duab, cov ntaub ntawv sib txawv, cov kev cai encoding, kev ruaj ntseg chaw, ua tiav, ntim thiab xa mus rau qhov chaw.
