Could someone tell me what the phanblet?

I really doubt you'll be able to find anything that's within that price range and that screen size...not new/reputable anyway. You might be able to find a something from a couple years ago, but even so it will hardly be a new unit.

The cheapest I can think of are Xiaomi's Redmi line, the Elephone, and a couple of not-so-trusted ones (Leagoo Shark and Vodafone Smart Ultra).
 
Xiaomi Max (6.4 inch, 48xx mAh), Redmi Note 4 (5.5 inch, 4000 mAh).
Or you can choose Samsung Galaxy A9 Pro or A7.
 

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