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As you can see above,the gprs modem is necessary partner of credit card terminal which is used widely in supermarket or shopping mall,easy to use,just charge in your sim card.This device is most popular in India,Morocco,South Africa,South America(Q24plus module inside).
Here below are the details for your reference,pls check.Sample is available for your test,if possible you are welcome to our factory directly,discuss face to face.
The key cable connect them together
GSM/GPRS Modem 850/900/1800/1900MHz TCP/IP stack