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[12V POWER INPUT] Designed for DC 12V use with a workable range of 10V to 15V this relay module matches common power systems and uses only 0.04W standby power to support efficient operation. [01 TO 5S TIMING] Built with an NE555 time chip and adjustable resistor this board delivers a 0.1 to 5 second delay range with 1 percent accuracy giving stable and precise delay control. [30A LOAD SWITCHING] The relay supports loads up to AC 30A or DC 30V 30A and provides one normally open plus one normally closed output group for flexible equipment connection. [AUTO START MODES] No external is needed because timing starts at power on. Choose A or B mode by jumper to switch between on then off delay or delayed on operation. [SAFE PRACTICAL DESIGN] Reverse polarity protection helps prevent damage from wrong wiring while red and green indicators show power and relay status clearly making installation and use easier.