It's a simple adapter that lets you power something from USB through an SMA cable. Useful for the 1.3 GHz FETProbe and similar weird gadgets!
Note: there is no overcurrent protection on this adapter. Only use this if you're sure that your device won't overload the USB power supply. If in doubt, use a powered external hub.
An LED! It has an LED on the 5 V rail!
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