- High/low level trigger: The 12 V relay can be controlled by either high-level or low-level triggers, providing flexible interfacing with different controllers. - Optocoupler isolation: Uses optocoupler insulation to effectively separate input and output circuits, increasing system stability and safety. - 1-channel relay expansion card: A single relay output channel that can control the switching status of external devices or circuits. - 12 V power supply: Operates from 12 V power, suitable for a variety of common electronic devices and development boards. 1 channel 12 V relay board for Arduino. Applications and compatibility - Arduino and other 12 V powered projects: Easily integrates as a relay expansion for microcontroller projects requiring safe isolation. - Home automation and small electronics control: Suitable for switching lamps, appliances, or external devices from a microcontroller while maintaining input-output separation. - Prototyping and testing: Useful for experiments that require switching external loads like motors or solenoids from a development board.