GERI 12V Light Control Switch The Photoresistor Plus Relay Module The Light Detection Switch Photosensitive Sensor $9.80 B00VFBUFUS
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GERI 12V 8-Channel Relay Module with Optocoupler H/L Level Triger for Arduino B00VNDFEIG
GERI Relay Module 12v Delay Switch Ne555 Module Timer 0-20s B0126WT5QO