5V activelow fourchannel relay module that can be controlled directly by various microcontrollers and PLCs. Key features and benefits 5V activelow operation: Each input activates the corresponding relay when driven LOW, providing simple logiclevel control from common microcontroller outputs. 4 independent channels: Four relays allow separate control of multiple loads from a single board. Broad compatibility: Can be driven directly by Arduino, AVR, PIC, ARM microcontrollers, and PLCs using the standard interface. current switching capability: Suitable for controlling appliances and other equipment that require larger current than a microcontroller can provide. Standard interface for direct MCU connection: Designed to connect easily to microcontroller boards without special adapters. Typical applications Home automation projects: Use with a microcontroller or PLC to switch lighting, fans, or other household devices as part of automation routines. Smallscale industrial or lab automation: Control pumps, heaters, or other equipment in a compact automation setup. Educational and prototype development: Learn relay control and implement basic control logic in Arduino, PIC, AVR, or ARM projects. Notes Specifications indicate 5V activelow operation and four relay channels with standard microcontroller compatibility. No current ratings, dimensions, or material details are provided in this description.