2 channel 12v relay module Dimensions: 50.5mm (length) * 38.5mm (W) * 18.5 (H) Weight:. 31g PCB Color: Black board four weeks with four screws holes, hole diameter 3.1mm, easy to install and fixed relay of high quality loose music relays SPDT. A common terminal, a normally open, one normally closed terminal optocoupler isolation, good …
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