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Wifi Gateway For Security Sensors direct from Wanlin Fire Protection — 12-year factory experience, SOS Emergency Button for Seniors (WL-PB400) certified CE/FCC/RoHS. Key specs: 4G/NB-IoT wireless, Wearable necklace/wristband, GPS location, 5-year lithium. MOQ 200pcs, OEM/ODM available.