Features: The Single Channel 3V relays Isolation Driver Module delivers precise signals control with enhanceds isolation technology, ensuring stable low voltages operations for development board accessories. Featuring universals compatibility and modulars design, this relays control module integrates seamlessly with open source hardware systems while preventings reverse current damage via PCB materials. for electronics enthusiasts, iots developers, and industrial engineers seeking low power solution for prototyping or automation projects requiring isolated driver modules. Perfect for solar powered devices, robotics controls, and sensorings based application where energy efficient 3V relays modules ensures safe signals transmission in setups. Its toolless installation and optimized 3V circuit design minimize debugging time, making it for educational labs, smart home systems, and portable electronics development. Specifications: Materials: Circuit Board Size: 70x17mm Package Includes: 5Pcs Power relays Module note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.