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This adjustable timer relay module works at DC 12V, with a flexible timing range from 1 second to 24 hours. It supports infinite repeat loop operation to realize automatic cycle on and off switching. Multiple control modes meet various delay and timing needs. Adopting high precision control chip, it ensures accurate timing and stable long-term operation. Small size and simple installation, widely used for equipment automatic start and stop, light control, fan timing, motor control and various electronic DIY project applications.