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BUY GS-R405 https://www.utsource.net/itm/p/1571193.html
20W TO 140W STEP-DOWN SWITCHING REGULATOR FAMILY
GS-R405 is a module manufactured by Gensonic. It is a 4-channel relay module with a 5V DC power supply. Description: The GS-R405 is a 4-channel relay module with a 5V DC power supply. It has a built-in optocoupler for isolation protection, and each channel is equipped with a LED indicator. It can be used to control various electrical devices, such as lights, motors, and other electrical appliances. Features: 4-channel relay module 5V DC power supply Built-in optocoupler for isolation protection Each channel is equipped with a LED indicator Can be used to control various electrical devices Applications: Home automation Industrial control Security systems Automotive applications Robotics (For reference only)