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Module Properties: NE555 chip. It can also be used in making hobby projects. And is also compatible with Arduino, Raspberry Pi, ESP32, ESP8266, AVR, PIC, 8051, etc. When no power applied the module, the state of the module is "NO" [normal open], CB and COM are conductive.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.