**High-Performance Microcontroller for
Reliable Automation: ** Equipped with an 8-bit high-performance microcontroller, this USB relay module ensures efficient and reliable home automation, perfect for smart home enthusiasts.; **Versatile
Power Supply Options: ** The module supports both USB and external 5V power supply, offering flexibility and reliable power management for seamless operation of up to four devices.; **Enhanced Safety with
Overcurrent Protection: ** Features built-in overcurrent protection and relay diode freewheel protection, ensuring safe and long-lasting use with a relay life of up to 100, 000 cycles.;
**User-Friendly Serial Control: ** Easy setup with CH340 USB to serial port control chip and supports simple relay switch status checking with command: 0xFF, making it convenient for users to manage their devices.; **Compact Design with
Clear Indicators: ** The compact 56*63mm board includes power and relay status LED indicators, providing clear visual feedback and making it ideal for space-constrained installations.