Each pack contains 2 ready to use module with construction, supporting DC3V-24V voltages ranges for flexible deployment in robotics, intelligent home systems, and industrial control panel The Optocoupler Isolation Board features PC817 chip for 5KHz high frequency signals conversion, offering DC3V-5V / 12V / 24V isolation protections and NPN shifting between circuits Ideal for electronics engineers and industrial automation technicians requiring reliability signals isolation in systems, microcontroller interfaces, or motor control applications Design with positive phase amplification and 1channel isolation, this module maintains equal input / output signals while voltages interferences through photoelectric coupling technology Perfectly integrates with microprocessor I / O switching, power regulation equipment, and communication devices needing voltages isolation up to 24V in harsh electrical environment