Key features

• •**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.