I must say the galaxy J7 duo is the best phone for the ones who are looking for the most precious experiences .my personal opinion I have used this model.the display is 5.5 inch.which would give you are comfortable for the visual experience. the battery backup is 3000 Li-ion battery(removable).The OS Oreo 8.0 is being installed in this model which gives a better platform and the chipset is EXYNOS 7885 OCTA . The camera spec are way more reliable the primary camera is 13 MP which includes LED Flash and the Secondary camera is 8MP which also have LED flash which gives you more clarified pictures which you are expecting. It supports 2G, 3G, 4G.
The more features are the have FINGERPRINT(front-mounted)
, supports micro SD 32GB and expandable upto 256GB,
The internal storage of this model is 32GB, and 4GB RAM
HOPE YOU WOULD EXPERIENCE A BETTER FEATURE .!