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Terminal Block Wiring: All interfaces connect directly through screw terminals, no soldering required. Four mounting holes for secure installation. Fault-Tolerant Design: Relay stays in place even if control wire breaks. Green power LED and red relay status LEDs for clear visual feedback. Mode Selection: allows high or low level per channel. Works with 5V, 12V, or 24V operating voltage. Isolated Stable Performance: Patch optocoupler isolates control from load, ensuring stable 5mA current. Genuine relay with normally open contacts. Wide MCU Compatibility: Directly controlled by 8051, AVR, PIC, DSP, ARM, MSP430, and other 5V TTL logic microcontrollers.