This was a set up! The question of the day had an answer for tablets and phones. 
You sneaky devils!
No specs? Tablet clamp width, desk clamp width, gooseneck length, tablet weight…
Zooming in on the box you can see 3" clamp opening and that’s about it
Bought similar design before and it’s a dumb design. The clamp force is created by tightening the knob but because it’s at the end it never creates enough force to be stable. The tighter you make the more it splits open. Flimsy and made of cheap plastic parts for the clamp. Even if it holds, it will get undone if you try to adjust the neck. I wouldn’t recommend it for any price.
Looked on Amazon and no info there either.
Found this on the Cobaltx site:
This gooseneck tablet holder clamp, compatible with all 4.7 - 10.5 inch cell phones and tablets, such as iPad mini 2 3 4, iPad pro 9.7 10.5 inch, iPad 9.7 2018 / 2017, 2018 new iPad pro 11 inch, ipad 5th 6th generation, iPad air, iPad air 2, Galaxy Tab A 10.1 10.5 9.7 8, Samsung Galaxy Tab S 8 9.7, Samsung Galaxy Tab E 9.6, Lenovo tablet, Nintendo Switch. 
4.7 - 10.5 inches refers to the diagonal length of the device screen.
Similar to what pigowar said, I had one anf the clamp broke because it would never get tight enough yo keep it stable. Don’t buy.