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The module uses HID technology, does not require any driver, plug and play. Support WIN7, XP 32-bit, 64-bit system, easy to use simple. 5V relay, the relay can control the large 250V, 10A AC load and 30V, 10A DC load. Control terminal connection mode: NC / COM / NO. Onboard square USB interface, stable connection. PCB size: 56.5mm * 24.9mm. Fixed hole size: 3mm, fixed hole center moment: 52.2mm * 20.6mm. 5V relay, the relay can control the large 250V, 10A AC load and 30V, 10A DC load Onboard square USB interface, stable connection Control terminal connection mode: NC / COM / NO. PCB size: 56.5mm * 24.9mm. Fixed hole size: 3mm, Fixed hole center moment: 52.2mm * 20.6mm Package Included: 1*1-Channel 5V Relay Module