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BUY GS-R412/2 https://www.utsource.net/itm/p/1731465.html
SMALL SIZE STEP-DOWN SWITCHING REGULATOR FAMILY
GS-R412/2 is a module manufactured by GIGA-TMS Technology. It is a 4-channel relay module with a wide range of applications. Description: The GS-R412/2 is a 4-channel relay module with a wide range of applications. It is designed to be used with a microcontroller such as an Arduino or Raspberry Pi. The module features four relays, each with its own LED indicator, and a power indicator LED. The module also has a built-in opto-isolator to protect the microcontroller from high voltage spikes. Features: * 4-channel relay module * Wide range of applications * Built-in opto-isolator * Power indicator LED * LED indicator for each relay Application: The GS-R412/2 can be used in a variety of applications, such as controlling motors, lights, and other devices. It can also be used to control home automation systems, such as controlling lights, fans, and other appliances. (For reference only)