Feature: 1. HIGH LEVEL OR PULL DOWN OUTPUT: Whether the output terminal is high level output or pull down output can be realized through the jumper cap 2. SIMULTANEOUS CONTROL DIFFERENT VOLTAGES: The 4 channels of 817 on the board are independent, which can realize simultaneous control of different voltages, etc. 3. TURN ON CONTROLLED TERMINAL: Can realize 3.3V or 5V control interface of 3.6-24V voltage level, after the control terminal is turned on, the controlled terminal will also be turned on 4. DRIVE VARIOUS OCCASION: Optical isolation has strong interference resistant ability, which can drive high power transistors, MOS tubes and other occasion that require high voltage drive, and can also directly drive low power 24V relays to work 5. EXCELLENT PCB: Good quality PCB materials possess reliability and miniaturization, good maintenance and interchangeability Specification: Item Type: Optocoupler Isolation Board Material: PCB Driver Signal Voltage: 3.6-24V Output Voltage Range: 3.6-30V (output current depends on the specific situation, but the maximum power is not exceed 10MA, the total power is constant, the voltage and current are inversely proportional). Package List: 1 x Optocoupler Isolation Board Note: If it is a pulse signal, please note that the limit of 817 is below 4KHZ, please do not use this module for control signals greater than 4KHZ, which will not work properly.