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Double SIM card for double output channel on board GSM SMS remote controller, US $ 90 - 150 / Set, Shanghai, China, WAFER, GSM-DKEY-AC2000.Source from Shanghai Wafer Microelectronics Co., Ltd. on Waimaotong.com.
3G version 400 house Waterproof Standalone gsm keypad wireless door intercom access controller
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Innovative 4G Seven Channel Relay output GSM remote controller for American and canada
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