The Oppo A57 sports a 5.2 inch 720p display which is powered by Qualcomm Snapdragon 435 chipset with Octa core Cortex A53 CPU and coupled with Adreno 505 GPU. It has main 13MP camera with f/2.2 aperture and a 16MP front camera with f/2.0 aperture for selfies. The smartphone comes with 32GB of expandable storage with 3GB of RAM. The phone houses a 2900mAh battery and has connectivity support such as LTE, bluetooth, WiFi, GPS and 3.5 mm audio jack.
Source
This dual SIM phone runs on ColorOS based on Android Marshmallow 6.0. The smartphone is to be available from December 12 in China at just CNY 1599 which is around ₹16000. A57 also has a fingerprint sensor on the physical home button. The Oppo A57 measures at 149.1 x 72.9 x 7.65 mm and weighs at just 147 grams. The phone comes in two color variant gold and rose gold both in a metal casing.
Source
