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This set comes with 5 pieces of HK19F series small signal relays, with the main model HK19F-DC12V-SHG. It supports 3VDC, 5VDC, 12VDC and 24VDC coil voltages, featuring a standard 8-pin DIP structure for easy PCB soldering. Designed with low power consumption and reliable contact performance, it is ideal for DIY electronic projects, smart home modifications, and repairing or upgrading household appliances such as timers, remote controls, security alarms and small control modules. The compact structure and durable design ensure stable long-term operation in various low-voltage control circuits.