The Samsung Galaxy J7 Duo mobile features a 5.5 (13.97 cm) display with a screen resolution of HD (720 x 1280 pixels) and runs on Android v8.0 (Oreo) operating system. The device is powered by Octa core, 1.6 GHz processor paired with 4 GB of RAM. As far as the battery is concerned it has 3000 mAh. Over that, as far as the rear camera is concerned this mobile has a 13 MP camera . Other sensors include Proximity sensor, Accelerometer. So, does it have a fingerprint sensor? Yes, it does. On board storage is at 32 GB with the option to expand the memory by Yes Up to 256 GB. Design is one of the most important factors when it comes to mobiles.