This is a tablet holder for an XBox One Controller. It is specifically designed for an 8" NuVision TM800W610L Tablet, but it may also be used with other 8" tablets. There is also a version that fits an iPhone 6+ with a slim case for use with SmartGlass.
The XBox controller has an open audio port. There is also a hole to prevent the grip from pressing the sync button, which I found to be a problem with another grip on this site.
The idea was that this $80 Windows 10 tablet, when paired with a USB Wireless AC adapter and a Bluetooth XBox One S controller, would become a perfect device for streaming Steam and XBox One. Plus it can make some light games and emulators itself. It's not quite a Nintendo Switch, but it's not bad for approx. $150.