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remote rs232 gsm

1.850/900/1800/1900MHz,quad band supported 2.Power supply: 5-12V (6-24V customize) 3.RS232 gsm modem, data monitor and control

gsm sim900e

gsm sim900e: 1.Quad-Band 850/900/1800/1900MHz 2.Dimensions: 19.8*19.8*2.7 mm 3.Weight: 2.2g

2014 hot sale cheap wireless GSM alarm systems

1.Cheap and high stable GSM security alarm system 2.Hot sale cheap and economic GSM seurity alarm systems