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We sell 100% brand new and high quality products. You can get what you want here at a competitive price! Don't hesitate, just buy it!Description: - Mini optocoupler isolation, signal level conversion module. - Suitable for general level conversion. - 24V side can use long wire connect with button, the output side is connected to the MCU IO pin. - The highest signal frequency is 2KHz. - With input signal indicator, reverse connection protection for diode and current limiting resistor. - The output end is an optocoupler triode, NPN output ; The output terminal has current limiting resistance, and can not directly drive the relay module and other high current equipment.Specification: - Optocoupler: EL357N - Input signal voltage: DC 24V - Output signal voltage: DC 12V - Output signal type: NPN - Signal frequency: