You might be selecting a simulated device in NI MAX. The icon color of the NI-DAQmx simulated devices differs from real devices. Real devices are green and chassis are grey, while simulated devices and chassis are yellow.
Just as with any device, you can rename them or delete them, according to your development needs. Refer to the document Using NI-DAQmx Simulated Devices to Develop without Hardware to know more about how these devices work.
For the instructions to create a new Simulated Device, refer to the document: NI-DAQmx Simulated Devices
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