Free Drive Usb Control 2-Way 5V 2 Channel Relay Module Computer Control PC intelligent Control
Free Drive Usb Control 2-Way 5V 2 Channel Relay Module Computer Control PC intelligent Control
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Free Drive Usb Control 2-Way 5V 2 Channel Relay Module Computer Control PC intelligent Control

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Key item features

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. 
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