Product Description The module uses HID technology, trade quality, without any drivers, downloads, which comes with the application, plug and play. Support WIN7, XP 32-bit, 64-bit systems, easy to use and simple. Module Description: 1. Onboard square USB interface to connect stable 2. The use of imported high-performance USB controller chip 3. Use genuine loose music relay 4. The military grade PCB board production 5. 4-way?? 8-way power interface aside, connected to power, even if the computer off or unplug the USB from the computer, you can also relay remains set. 1-way and 2-way no power connector. 6. PCB size: 56.5 mm * 40.6 mm 7. fixing hole size: 3mm, fixing holes central moments: 52.2 mm * 36.6 mm product parameters: 1. The relay is 5V loose music relay, the relay can control the maximum 250V, 10A AC load and 30V, 10A DC load 2. The control terminal connection mode: NC / COM / NO. application: Green indicates that the relay is closed and red disconnect