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ESEEK M600 Programmer SDK Scanner Unit

ESEEK-M600-Programmer-SDK-Scanner-Unit-PRODUCT

Cov ntaub ntawv khoom

Khoom npe M600 Tus neeg siv phau ntawv thiab Programmer SDK
Kev kho dua 1X
Cov ntaub ntawv naj npawb XXXXXXXXXX - 1 X
Hnub tim Kaum Ib Hlis 29, 2022
Chaw tsim tshuaj paus E-Nrhiav Incorporated
Cov cim lag luam E-Seek thiab E-Seek logo yog cov cim lag luam ntawm E-Seek
Incorporated.
Webqhov chaw www.e-seek.com
Chaw nyob R & D Center 9471 Ridgehaven Ct. #E San Diego, CA
92123
Xov tooj 858-495-1900 Ib
Fax 858-495-1901 Ib

Cov lus qhia siv khoom

  1. Nyeem cov neeg siv phau ntawv ua tib zoo kom paub koj tus kheej nrog cov khoom.
  2. Xyuas kom meej tias lub cuab yeej ua raws li Tshooj 15 ntawm FCC Cov Cai thiab Kev Lag Luam Canada daim ntawv tso cai-tsim RSS(s).
  3. Nruab lub cuab yeej nrog qhov tsawg kawg nkaus ntawm 20 cm nruab nrab ntawm lub tshuab hluav taws xob thiab koj lub cev kom ua raws li FCC cov kab hluav taws xob raug txwv.
  4. Xa mus rau lub rooj ntawm cov ntsiab lus kom yooj yim navigation los ntawm phau ntawv.
  5. Ua raws li cov lus piav qhia ntawm lub cuab yeej rau ib qho dhauview Qauv: M600.
  6. Review cov khoom specifications kom nkag siab cov ntsiab lus technical.

Copyright © 2022 E-Seek Incorporated. All Rights Reserved.
E-Nrhiav tseg txoj cai los hloov pauv txhua yam khoom los txhim kho kev ntseeg siab, ua haujlwm lossis tsim qauv.
E-Nrhiav tsis suav tias yog ib qho kev lav phib xaub uas tshwm sim los ntawm, lossis cuam tshuam nrog, daim ntawv thov lossis kev siv cov khoom, Circuit Court lossis daim ntawv thov tau piav qhia hauv qab no.
Tsis muaj ntawv tso cai tau tso cai, tsis hais meej lossis los ntawm kev cuam tshuam, estoppel, lossis lwm yam raws li txoj cai patent lossis patent, npog lossis cuam tshuam nrog kev sib xyaw ua ke, system, apparatus, tshuab, cov khoom siv, lossis cov txheej txheem uas E-Seek cov khoom yuav raug siv. Daim ntawv tso cai implied tsuas muaj rau cov khoom siv, circuits thiab subsystems uas muaj nyob rau hauv E-Seek cov khoom.

E-Seek thiab E-Seek logo yog cov cim lag luam ntawm E-Seek Incorporated. Lwm cov npe ntawm cov khoom lag luam uas tau hais hauv phau ntawv qhia no yuav yog cov cim lag luam lossis cov npe lag luam ntawm lawv cov tuam txhab thiab tau lees paub ntawm no.
Nco ntsoov tias lub sijhawm no PDF417, MRZ, thiab QR code decoders tau sau tseg tab sis tseem tsis tau ua haujlwm.
Nco ntsoov tias M600 RFID cuam tshuam rau PC siv tus qauv CCID USB chav kawm thiab tsis suav nrog cov ntaub ntawv no.

E-SEEK Inc.
Webqhov chaw: www.e-seek.com

Patented Khoom
R & D Center
9471 Ridge muaj Ct. #E
San Diego, CA 92123
Tel: 858-495-1900 Ib
Fax: 858-495-1901 Ib

Federal Communication Commission Interference Statement
Cov cuab yeej no ua raws li Tshooj 15 ntawm FCC Cov Cai. Kev ua haujlwm yog ua raws li ob yam hauv qab no:

  1. Cov cuab yeej no yuav tsis ua teeb meem cuam tshuam, thiab
  2. Cov cuab yeej no yuav tsum lees txais kev cuam tshuam tau txais, suav nrog kev cuam tshuam uas yuav ua rau tsis muaj kev ua haujlwm.

Cov cuab yeej no tau raug sim thiab pom tias ua raws li cov kev txwv rau Class A cov cuab yeej digital, ua raws li Tshooj 15 ntawm FCC Cov Cai. Cov kev txwv no yog tsim los muab kev tiv thaiv tsim nyog tiv thaiv kev cuam tshuam tsis zoo hauv kev teeb tsa hauv tsev. Cov cuab yeej no tsim, siv thiab tuaj yeem ua kom lub zog ntawm lub xov tooj cua thiab, yog tias tsis tau nruab thiab siv raws li cov lus qhia, yuav ua rau muaj kev cuam tshuam rau kev sib txuas lus hauv xov tooj cua. Txawm li cas los xij, tsis muaj kev lees paub tias kev cuam tshuam yuav tsis tshwm sim hauv ib qho kev teeb tsa tshwj xeeb. Yog tias cov cuab yeej no ua rau muaj teeb meem cuam tshuam rau lub xov tooj cua lossis TV txais tos, uas tuaj yeem txiav txim siab los ntawm kev tig cov cuab yeej tawm thiab qhib, tus neeg siv tau raug txhawb kom sim kho qhov cuam tshuam los ntawm ib qho ntawm cov kev ntsuas hauv qab no:

  • Reorient los yog tshem tawm cov kav hlau txais xov.
  • Ua kom muaj kev sib cais ntawm cov khoom siv thiab lub receiver.
  • Txuas cov cuab yeej siv rau hauv qhov hluav taws xob ntawm lub voj voog sib txawv ntawm qhov uas lub receiver txuas nrog.
  • Nrog rau tus neeg muag khoom lossis tus kws tshaj lij xov tooj cua / TV rau kev pab.

FCC ceeb toom: Ib qho kev hloov pauv lossis kev hloov kho uas tsis tau pom zoo los ntawm tog neeg lub luag haujlwm rau kev ua raws cai tuaj yeem ua rau tus neeg siv txoj cai ua haujlwm ntawm cov cuab yeej no. Lub transmitter no yuav tsum tsis txhob muab tso rau hauv los yog ua haujlwm ua ke nrog lwm tus kav hlau txais xov lossis cov khoom xa tawm.

Radiation Exposure Statement:
Cov cuab yeej no ua raws li FCC cov kev txwv tsis pub muaj hluav taws xob tau teeb tsa rau qhov chaw tsis muaj kev tswj hwm. Cov cuab yeej no yuav tsum tau nruab thiab ua haujlwm nrog qhov deb tsawg kawg 20 cm ntawm lub tshuab hluav taws xob thiab koj lub cev.

Kev lag luam Canada
Cov cuab yeej no muaj daim ntawv tso cai xa tawm / tau txais daim ntawv tso cai uas ua raws li Innovation, Science thiab Economic Development Canada daim ntawv tso cai-tsim RSS(s). Kev ua haujlwm yog ua raws li ob yam hauv qab no:

  1. Cov cuab yeej no yuav tsis ua rau muaj kev cuam tshuam.
  2. Cov cuab yeej no yuav tsum lees txais ib qho kev cuam tshuam, suav nrog kev cuam tshuam uas yuav ua rau lub tshuab ua haujlwm tsis xav tau.

Taw qhia

Ua tsaug rau koj xaiv lub cuab yeej no.
Tus Neeg Siv Phau Ntawv Qhia no muab cov lus piav qhia txog cov txheej txheem kev ua haujlwm thiab kev ua haujlwm APIs rau E-nrhiav Model M600. Ua tib zoo nyeem tus neeg siv phau ntawv qhia ua ntej siv lub cuab yeej no.
Cov ntxaij vab tshaus tiag tiag uas tshwm sim yuav txawv me ntsis ntawm cov duab tshuaj ntsuam uas siv hauv Cov Neeg Siv Khoom Qhia no. Model M600 scanner Unit yog tom qab ntawd hu ua "cov cuab yeej no"

Phau ntawv Convention

  • Ceev faj: Qhov no ceeb toom ntawm qhov ua tau ntawm kev puas tsuaj rau cov cuab yeej no.
  • Tseem ceeb: Qhov no qhia txog cov lus qhia uas yuav tsum tau ua kom paub tseeb tias qhov ua haujlwm raug thiab ua haujlwm ntawm cov cuab yeej no.
  • Nco tseg: Qhov no qhia txog ib yam khoom tseem ceeb.
  • Ceeb toom: Qhov no qhia tau hais tias ib qho tseem ceeb ntawm cov txheeb ze.
  • Paub meej: Qhov no qhia txog ib yam tseem ceeb.

Kev txwv

  • Kev siv tsis raug tso cai lossis luam tawm ntawm Tus Neeg Siv Phau Ntawv Qhia no, txawm hais tias nws tag nrho lossis ib feem, raug txwv nruj heev.
  • Cov ntaub ntawv muaj nyob rau hauv Cov Neeg Siv Phau Ntawv Qhia no yuav raug hloov pauv yam tsis tau ceeb toom.

KHOOM PLIG
Cov cuab yeej no yog ID3, ID1, thiab tus nyeem ntawv nkag mus.

KEV PAB CUAM

E-Seek Model M600 ID Reader qhia txog tus qauv kev ua haujlwm tshiab rau kev nyeem daim npav ID. Nws tuaj yeem nyeem daim npav ID3 thiab ID1 yam tsis muaj hood los ua kom yooj yim nyeem cov ntaub ntawv. Boarding pass barcodes kuj tuaj yeem nyeem tau. Kev ua tiav cov duab zoo yog ua los muab cov duab zoo ID1 yam tsis muaj hood.
Tus qauv M600 SDK kuj suav nrog MRZ, QR, thiab PDF417 decoders. Nws txuas rau lub PC siv lub siab ceev USB 2.0 kev twb kev txuas.

TshajVIEW Qauv: M600
Cov duab, 1 thiab 2 qhia txog cov qauv loj thiab cov khoom ntawm M600.

ESEEK-M600-Programmer-SDK-Scanner-Unit-1

PRODUCT SPECIFICATION

Cov khoom Kev piav qhia
Kev yees duab Sensor: 2D CMOS

 

Kev daws teeb meem: RGB / IR 600dpi, UV 300dpi

 

Xim qhov tob: RGB / UV: 24 ntsis / pixel, IR: 8 khoom / pixel Lub teeb Sources: Pom (dawb), IR (870 nm), UV (365 nm)

Duab tso zis hom: BMP

Daim npav ntse Contactless: ISO 14443 A / B, NFC,
Ceeb toom Mloog tau: Pib

 

Qhov taw qhia pom: 2 RGB xwm txheej LEDs

Kev sib txuas USB 2.0 Kev kub ceev.
Hluav taws xob Input hwj chim: 5V input voltage. Kev siv hluav taws xob: TBD

Fais fab adaptor:

AC110-240V, 50/60Hz 0.35A Max

Tawm tswv yim: 5V 2Amps

Lub cev Qhov Loj:

Ntev: 195mm Dav: 160mm

Qhov siab: 109mm / 102mm (rau iav) Nyhav: 900grams (2lbs)

Yees duab capture qhov rais: 130 x 95 mm (5.12 x 3.74 ") Anti-reflective thiab khawb resistant iav

Ib puag ncig Kev Ua Haujlwm Kub: -10 ° C txog 50 ° C (14 ° F txog 122 ° F) Cia: -20 ° C txog 70 ° C (-4 ° F txog 158 ° F)

Humidity: Ua haujlwm: 5-95% (tsis-condensing) plua plav: IP5x

TECHNICAL DETAILS
  • RGB 24 ntsis @ 600 dpi
  • IR 8 ntsis @ 600 dpi
  • UV 24 ntsis @ 300 dpi
  • ID3, ID1, thiab boarding pass
  • Decodes MRZ
  • Decodes QR
  • Kev txiav txim siab 2D (PDF417) & 1D
  • USB 2.0 Kev kub ceev
  • Hoodless kev ua haujlwm
  • RFID
  • Patented
HLOOV NTAWV

Lub pob M600 suav nrog:

  • M600 Device
  • USB Cable
  • Calibration Card (???)

USB CABLE
Lub M600 yog muab nrog USB interface cable. Cov kab no tso cai rau M600 los cuam tshuam nrog tus qauv USB 2.0 kev kub ceev chaw nres nkoj ntawm koj lub computer.

ESEEK-M600-Programmer-SDK-Scanner-Unit-2

DAIM NTAWV THOV CALIBRATION CARD

ESEEK-M600-Programmer-SDK-Scanner-Unit-3

Daim npav calibration yog siv los ntsuas qhov nyiaj tshuav dawb. Calibration yuav tsum tau tom qab shipping los yog siv ntev. Txhawm rau ua qhov dawb tshuav calibration yooj yim ntxig daim npav nrog rau sab xub thawj.
Tom qab siv ntev lossis yog tias daim npav tau khawb nws yuav tsum muab pov tseg.

THOV KOM TAU

  1. Lub M600 scanner siv WinUSB tsav tsheb thiab tsis muaj kev teeb tsa rau Windows8, Windows10, lossis Windows11.
    Txuas lub M600 Fais fab cable thiab lub zog ntawm lub tshuab luam ntawv.

M600 yuav tsum tshwm nyob rau hauv Universal Serial Bus li hauv Device Manager.

ESEEK-M600-Programmer-SDK-Scanner-Unit-4

Hauv qhov no, xyuas M600 sab saum toj LED xwm txheej, thiab xyuas kom meej tias lub teeb ntsuab yog ON.
Yog tias lub teeb RED ntsais nws txhais tau tias lub scanner ntsib qhov yuam kev tuag. Txheeb xyuas hom kev ua yuam kev los ntawm kev qhib "M600dll.log" file.

Khiav DEMO APPLICATION
Download tau daim ntawv thov M600 Demo los ntawm http://e-seek.com/products/m-600/

SCOPE

Lub PC software muaj ib daim ntawv thov exe, C# API sib dhos, thiab C / C ++ DLL uas sib txuas lus nrog M600 dhau USB. Cov ntaub ntawv no suav nrog M600 C# sample daim ntawv thov thiab C# API uas muab C# tus tsim tawm ib qho yooj yim interface rau M600 DLL. Lub M600 muaj RFID module uas siv tus qauv Microsoft CCID interface uas tsis tau them los ntawm daim ntawv no. Kev ua haujlwm

Thaum ib daim npav tso rau M600 firmware yuav:

  • Automatically scan ib daim ntawv yog enabled
  • Txiav txim siab MRZ yog tias muaj
  • Txiav txim siab rau PDF417 yog tias muaj
  • Tshawb xyuas siv White LEDs
  • Tshawb xyuas siv IR LEDs
  • Tshawb xyuas siv UV LEDs

LEDs qhia
M600 LED xwm txheej rooj yog raws li nram no:

ESEEK-M600-Programmer-SDK-Scanner-Unit-5

GUI

ESEEK-M600-Programmer-SDK-Scanner-Unit-6

Daim duab 9 qhia thiab ID3 daim ntawv thiab daim duab 10 qhia thiab ID1 daim ntawv. Cov duab ID1 raug cropped.
Lub GUI muaj peb lub me me ua ntejview cov duab ntawm sab laug thiab ib daim duab loj loj.

LUB SIJ HAWM PREVIEW PANE

ESEEK-M600-Programmer-SDK-Scanner-Unit-7

Muaj peb qhov me me uas tso saib daim npav scanned siv cov teeb pom kev sib txawv.

  • Thawj daim duab raug ntes siv lub teeb dawb.
  • Daim duab thib ob tau raug ntes siv IR teeb.
  • Cov duab kawg tau raug ntes siv lub teeb UV.

ARCHITECTURE

Lub hom phiaj tseem ceeb ntawm C# demo daim ntawv thov yog muab tus example ntawm yuav ua li cas sau ib daim ntawv thov uas cuam tshuam nrog M600 siv C# API.

ESEEK-M600-Programmer-SDK-Scanner-Unit-8

Daim ntawv thov (M600.exe lossis tus neeg siv daim ntawv thov), M600api.dll thiab M600dll.dllnd yuav tsum nyob hauv tib phau ntawv. Lub DLL yuav tsim ib lub log file (M600dll.log) nyob rau hauv cov npe uas nws tab tom khiav los ntawm lub neej ntawd tab sis nws tuaj yeem ua tsis taus yog tias xav tau.
Raws li tau hais nyob rau hauv Scope M600 muaj RFID module uas cuam tshuam rau lub PC raws li CCID USB chav kawm thiab tsis suav nrog cov ntaub ntawv no.

M600 DEMO APP
Qhov project C# M600APP muaj lub Main app thiab GUI. Nws tsim cov "M600.exe" executable.
Cov modules hauv qhov project no yog:

  • FormM600demo.cs
  • FormUpdate.cs

FORMM 600 DEMO.CS
Qhov no yog daim ntawv tseem ceeb thiab muaj cov cai uas cuam tshuam nrog M600 C# API. Nws hu rau Init() muaj nuj nqi uas pib M600DLL los sib txuas lus nrog M600 thiab hloov cov duab. Daim ntawv thov tus neeg siv yuav tsum hla WndProc() thiab hu rau M600's WndProcMessage() ua haujlwm yog tias nws xav tau txais USB txuas thiab txiav cov xwm txheej.

FORMUPDATE.CS
Cov qauv no muaj cov txheej txheem subroutines uas hloov kho GUI.

C# API

C# API muab qhov yooj yim interface rau M600. Tus tsim tawm C# yuav tsum tuaj yeem siv qhov kev sib txuas no kom nrawm nrawm nrog M600 yam tsis tas yuav cuam tshuam nrog M600 DLL tsis raug cai ncaj qha.
Daim ntawv thov yuav tsum sau npe rau cov xwm txheej hu rov qab thaum pib. Lub DLL yuav hu rov qab rau daim ntawv thov thaum muaj xwm txheej tshwm sim. Daim ntawv thov yuav tsum tau synchronize hu rov qab rau nws cov xov uas siv txoj kev Invoke hauv FormM600demo.cs.

API sib dhos yog instantiated hauv daim ntawv thov raws li:

pej xeem zoo li qub CM600api m_M600 = tshiab CM600api();

API FUNCTIONS
void SetLogDir(LOG_DIR) [Optional] Hu rau qhov no ua ntej Init() override lub neej ntawd log directory. Los ntawm lub neej ntawd yog tias qhov haujlwm no tsis hu ua M600DLL yuav tsim M600DLL.LOG file Nyob rau hauv tib directory nws yog khiav nyob rau hauv. Hla no muaj nuj nqi txoj hlua ntawm lub xav log directory. Txhawm rau lov tes taw nkag hla txoj hlua "null".

  • void Init()
    Hu rau qhov kev ua haujlwm no ntawm kev pib ua haujlwm xws li thaum lub sijhawm thauj khoom.
  • void RegCB(OnNewEvent)
    Sau npe kev tshwm sim hu rov qab.
  • void Close( )
    Hu rau txoj haujlwm no ua ntej kaw daim ntawv thov xws li thaum lub sijhawm kaw.
  • bool LogIn(bool bLogin)
    Thaum muaj tseeb, chav tsev yuav luam theej duab thaum ib daim npav nkag (ib txwm ua haujlwm).
    Thaum tsis tseeb, chav tsev yuav tsis luam theej duab thaum muab daim npav tso.
  • void UserBeep(E_BEEP eBeep)
    Tsim ib lub suab beep. E_BEEP enumeration muaj peb qhov tseem ceeb:
    PEB_1,
  • void GetVer (tawm M600_VER ver)
    Tau txais E-Seek serial tooj (EsSerNum), Silicon serial tooj (DsSerNum), DLL version, Barcode decoder version, firmware version, thiab kho vajtse version raws li tau hais los ntawm M600_VER qauv.
    Cov tswv cuab ntawm M600_VER qauv uas tej zaum yuav muaj kev cuam tshuam rau tus deverloper yog:
    ulong EsSerNum; // E-Nrhiav serial tooj
    //
    byte DllMajor; // DLL version naj npawb
    byte DllMinor;
    byte DllBuild;
    byte FwMajor; // Firmware version naj npawb
    byte FwMinor;
    byte FwBuild; // Ib txwm xoom
  • bool WrUserData (byte[] aryData)
    Sau tus neeg siv cov ntaub ntawv byte array rau flash (128 byte txwv).
    Flash yuav tsum tsis txhob siv khaws cia ntau zaus hloov cov ntaub ntawv raws li nws tsuas yog txwv rau 10,000 cov ntaub ntawv txhim khu kev qha.
  • bool RdUserData(byte[] aryData)
    Nyeem tus neeg siv cov ntaub ntawv byte array los ntawm flash (128 byte txwv).
    Nco ntsoov tias txhawm rau kom tau txais USB txuas thiab txiav tawm daim ntawv thov tus neeg siv yuav tsum hla WndProc() thiab hu rau M600 api's WndProcMessage.
  • tiv thaiv override void WndProc(ref Message m)
    {
    m_M600.WndProcMessage(ref m); // tshawb xyuas usb txuas thiab txiav tawm
    base.WndProc(ref m);

API OBJECTS

Chav kawm C# API M600_IMG muaj ib daim ntawv qhia me me rau txhua qhov ntawm peb lub teeb:
Bitmap bmBmRgb;
Bitmap bmBmIr;
Bitmap bmBmUv;

Thawj daim duab yog RGB.
Daim duab thib ob yog IR.
Daim duab thib peb yog UV.
Cov bitmap yuav raug cropped yog tias pom ib daim ntawv ID1.

Tus qauv C# API M600_BC muaj 2D cov ntaub ntawv qauv.

byte[] aryMRZ; // Byte array rau MRZ *
byte[] aryQR; // Byte array rau QR *
byte[] aryP417; // Byte array rau PDF417 *
hauv iBcOrient;
Yog tias PDF417 barcode pom lub iBcOrient keeb muaj plaub qhov tseem ceeb ntawm daim npav orinetation thiab xoom rau tsis paub.

  • 0 = Unknown orientation
  • 1 = Li qub orientation (Pem hauv ntej ntawm daim npav yog nyob rau sab xis).
  • 2 = Pem hauv ntej ntawm sab xis tab sis upside down.
  • 3 = Pem hauv ntej yog sab laug.
  • 4 = Pem hauv ntej yog sab laug thiab upside down.

Nco tseg tias rau qhov no tso tawm MRZ, QR, thiab PDF417 kev txiav txim siab tseem tsis tau muab tso rau.

EVENTS:
Tus neeg siv daim ntawv thov yuav tsum dhau ib tus neeg sawv cev ntawm kev pib mus rau M600dll kom DLL tuaj yeem hu rau tus delegate nrog tus nqi ntawm qhov kev tshwm sim.

Lub M600 DLL xa cov xwm txheej hu rov qab rau daim ntawv thov ntawm cov xov M600 DLL tsim.

  • EVENT_DISCOVERY
  • EVENT_SCANING Firmware tab tom luam theej duab ib daim ntawv
  • EVENT_IR IR duab npaj txhij
  • EVENT_RGB RGB duab npaj txhij
  • EVENT_UV UV duab npaj
  • EVENT_REMOVE Cov ntaub ntawv tuaj yeem raug tshem tawm
  • EVENT_BARCODE*
  • EVENT_MRZ*
  • EVENT_DONE Scan ua tiav
  • EVENT_USB_CON USB txuas nrog
  • EVENT_USB_DIS USB txiav tawm

Tsis yog: MRZ thiab bardode muaj nuj nqi tam sim no tsis tau implamented

PSEUDO CODE EXAMPLE

CM600api m_M600 = new CM600api(); // C# API khoom
m_M600.Init(M600_Callback); // hu rov qab rau cov xwm txheej
// Event callback
//
pej xeem void M600_Callback (int iEvent)
{
hloov (iEvent)
{
case EVENT_IR: // IR duab npaj
tawg;
rooj plaub EVENT_RGB: // RGB duab npaj txhij
tawg;
case EVENT_UV: // UV duab npaj
tawg;
rooj plaub EVENT_DONE: // Scan tiav
tawg;

}
}

m_M600.Close()

Kev kho mob

Muaj peb ntu los tswj M600:
Kev ntxuav tu (qib 3-5)
Calibration (Qib 6-7)

Kauj ruam 1: Ntxig rau Calibration Card

MECHANICAL DRAWINGS

ESEEK-M600-Programmer-SDK-Scanner-Unit-9

Cov ntaub ntawv / Cov ntaub ntawv

ESEEK M600 Programmer SDK Scanner Unit [ua pdf] Tus neeg siv phau ntawv
2A9IZ-M600, 2A9IZM600, m600, M600 Programmer SDK Scanner Unit, Programmer SDK Scanner Unit, SDK Scanner Unit, Scanner Unit

Cov ntaub ntawv

Cia ib saib

Koj email chaw nyob yuav tsis raug luam tawm. Cov teb uas yuav tsum tau muaj yog cim *