The Nexus Keyboard Folio is an extremely useful device. It allows one to type quickly using a Nexus Phone connected to the internet or else to start out with an email that needs to be sent when the computer has internet access.
Bluetooth Keyboard Setup
The keyboard needs to be charged awhile before it can be recognized properly by the Nexus Phone that it needs to connect to via Bluetooth.
Then, the keyboard needs to be turned on. In the package for the keyboard is a picture of the phone placement for the phone to recognize the keyboard. It is actually very important to place the phone on the keyboard just like it is pictures for it to work properly. Also, the battery of the keyboard does not display how many percent it is charged. So it is best to use an external power supply with a USB to micro-USB connector (the same connector used to charge the Nexus phone) when typing.
Purchasing and More Information on a Similar Amazon Unit
It is hard to find sellers for the exact unit. Perhaps the age of the unit has something to do with this. The newer units sometimes have lifetime phone support as well as warranty coverage for defective units. I was able to test one unit, successfully connecting to my Nexus Bluetooth phone.
A similar new unit can be found on the Amazon site for the "aIBaO iPad Keyboard Case 9.7 for iPad 2018 6th Gen iPad 2017 5th Gen iPad Pro 9.7 iPad Air 2 Air 1 iPad Case with Detachable Bluetooth Keyboard", costing new $37.99 or so. Used units are expected to cost less.
The link for purchasing or getting more information is here for the Amazon aIBaO iPad Keyboard Case 9.7 for iPad 2018 6th Gen iPad 2017 5th Gen iPad Pro 9.7 iPad Air 2 Air 1 iPad Case with Detachable Bluetooth Keyboard.
It is https://www.amazon.com/dp/B07KFB4HZ5/ref=psdc_11548963011_t3_B074J8WC2L