Elecfreaks Octopus 1 Channel Relay 3V Ef04086

This module is a single-channel relay designed as part of the Octopus series of electronic "bricks." It acts as an electrically-operated switch, allowing a low-power signal from a microcontroller (like a micro:bit, Arduino, or ESP32) to turn a completely separate, high-power circuit on or off. This is essential for projects where you need to control devices that require more voltage or current than a microcontroller pin can safely provide.