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Double SIM card gsm controller, US $ 90 - 150 / Set, China, WAFER, GSM-DKEY.Source from Shanghai Wafer Microelectronics Co., Ltd. on Waimaotong.com.
3G version 400 house Waterproof Standalone gsm keypad wireless door intercom access controller
Wireless 4G / 3G / GSM Big power output remote controller for America and canada
Innovative 4G Seven Channel Relay output GSM remote controller for American and canada
4G GSM relay switch 16 Way SMS texts for switching relay with dialling-in remote controller