This device offering a Octa-core 1.6 GHz Exynos 7870 CPU, which a latest 14mm architecture technology. It consumes less power than other.
GPU is Mali T-830, which is quite good for gaming. ( Asphatl 8 all settings run almost no lag)
Bettary Li-ion 3300mAh is good. It also comes with a ultra power saving mode.
Next thing is camera. U will have a rear 13MP, 28mm Autofocus camera with apperture 1.9, which is very good for bokeh ( background blurr) effect. The front facing 5MP ( f/1.9) with led flash is also very good for selfie. Samsung did not mention about camera sensor and lens eliments.
It comes with Android 6.0 ( Msrshmallo) .
Talking about design, u will get a same model and metal frame with brushed plastic removeable back cover as Galaxy J5.
The display is very bright and good at outdoor. It is a 5.5 720p amoled display with ~ 267 PPI.
In india it comes with a S-BIKE mode, which really helps bikers.
Now the down sides are, there is no Auto brightness sensor and no gyro sensor, that means it does not support VR. I think these two things are very important.
So I would like to say that if u r looking for some brand or some camera phone then Galaxy J7 is right choice for u. U can have a good experience of game with this device.