1-Channel 3V/3.3V Power Relay Module Supports Optocoupler Isolation Control Features Dual Power Supply Input for High Anti-Interference Capability Fast response time under 20ms and long lifespan up to 100,000 cycles Includes signal output indicator, screw terminals, and mounting holes Compatible with 10A 250VAC and 10A 30VDC Module Size: 70mm x 17mm x 20mm / 2.76 x 0.70 x 0.79 inches (L*W*H) TIP: When the jumper is connected, the relay's working power supply is also the signal power supply. When disconnected, the relay and signal power supply are isolated. Features: 1. With output signal indicator; 2. Signal input port can be connected to the IO port of a microcomputer and controlled by a high-level signal. 3. Dual power supply design offers strong anti-interference capability and high reliability with photoelectric isolation protection; 4. With flyback diode protection; 5. Response time is less than 20 milliseconds; 6. The relay has a long lifespan and can continuously switch 100,000 times; 7. External connection uses a rotary crimp terminal for a firmer connection; 8. With fixed mounting holes for easy installation. Provides a wiring diagram and a detailed instruction manual.