what is work of gsm in prepaid energy meter

To get full information or details of prepaid energy meter using gsm please have a look on the pages


http://studentbank.in/report-prepaid-ene...ile?page=3

http://edutwint-prepaid-energy-meter-using-gsm-mobile

http://edutwint-prepaid-energy-meter-using-gsm-mobile?page=2


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