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4G gas alarm nursing home direct from Wanlin Fire Protection — 12-year factory experience, WL-GA205 fully certified CE/EN54/FCC/RoHS. Key specs: 4G LTE + RS485, High-precision laser detection with 10-year calibration-free operation for industrial use. MOQ 100 sets, 20-25 working days, OEM/ODM custom branding available. Serving 60+ countries across Southeast···