It is a tiny USB OTG adapter. Don't use it with a pizero as the EMI reduces the ping's range to almost nothing.

Works great in a pi3 setup.

https://www.amazon.com/TRIXES-Adapter-Raspberry-Smartphones-Tablets/dp/B01AWJSVZY/ref=sr_1_1?ie=UTF8&qid=1491755978&sr=8-1&keywords=tiny+usb+otg