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Check the listing for details. DC 12V Relay Switch Control -20 to100℃ Digital Temperature Display Module Sensor. Condition: New. Listed at 2.90 USD. Refresh Rate: 0.5 S. Indicator Light Direction: Flash shows start-up delay of refrigeration or heating. Output: 1 channel relay output, capacity =20A 125VAC,20A 14VDC. keep lighting shows the relay has closed.