Yeah, but it's in your laptop so by your own self imposed limitation, you can't use it. Therefore, it has to be stand alone. I suggest a wi-fi hotspot detector such as:
Tear it apart and attach an external antenna. The only thing the USB port does is supply power. Find a cell phone USB charger/adapter and cable to power the hotspot detector.
If something like this is not what you want, kindly describe:
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