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This package includes 5 pieces of SJ-S series 4-pin relays (105DMH / 112DMH / 124DMH). They feature a normally open structure, support 5V/12V/24V DC control voltage, and can switch up to 10A 250VAC. Widely used in electronic DIY, industrial control, smart home devices, and small appliance circuits. Each relay is tested for reliable switching and durability.