The 4 Channel 12V DC Relay Module is a high-quality relay board designed to control four independent AC or DC electrical devices using a 12V DC control voltage. Featuring four electromagnetic relays, this module allows low-voltage controllers such as Arduino, ESP32, ESP8266, Raspberry Pi, STM32, PIC microcontrollers, and PLC systems to safely switch high-voltage or high-current loads including lights, motors, pumps, fans, solenoids, and household appliances.