3v 1 Channel Relay Power Switch Module With Optocoupler High Level Trigger For Esp8266 Development Board (pack Of 5) f54 1 channel 3V/3.3V power relay module support photocoupler isolation control. Support dual power supply input ensure high anti-interference abilityFast response time less than 20ms and longlife time up to 100,000 times snap actionOn-board signal output indicator, wire terminal and installing holescompatible with 10A 250VAC and 10A 30VDC load. Module Size: 70mmX17mmX20mm/2.76X0.70X0.79inch(L*W*H)Tips: when the jumper cap connected, the relay working power supply will also as the signal power supply, when not connected, the relay and signal power supply is isolated.Number of pieces delivered: 5Features:1. With output signal light;2. The signal input port can be connected to the IO port of the single-chip microcomputer, and is driven by a high-level signal.3. Dual power supply design has strong anti-interference ability and high reliability of photoelectric isolation protection;4. With diode freewheel protection;5. Response time is less than 20 milliseconds;6. The relay has a long service life and can continuously pull 100,000 times;7. The external connection adopts rotary crimp terminal to make the connection firmer;8. With fixed mounting holes for easy installation.Provide circuit diagram and detailed instruction manual.