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YL 333 Magnetic Anti theft Alarm for Door Windows 1 4 Inch Water Flow Sensor YF S402 Employee Attendance Management Systems integrating Employee Attendance Management Systems integrating fingerprint identification for automated time tracking Optocoupler Isolation: Relay driver circuit includes optocoupler isolation to protect the ESP8266 from relay switching noise and back EMF Are bulk discounts available aligned directly adjacent to the main unit
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