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This package includes 5 pieces of JRC-27F (HFD27) mini electromagnetic relays, also known as 4078 type, with 8 pins and 2A switching capacity. Models cover 5VDC, 12VDC, and 24VDC for different circuit requirements. Featuring high sensitivity and stable performance, they are widely used in electronic circuit boards, communication equipment, security systems, home appliances, and various DIY electronic projects. Easy to solder and install, perfect for maintenance, prototyping, and small device repair.