OPPO A57 is a smartphone that was launched in November 2016. It is a mid-range device that offers decent features and specifications for a reasonable price. In this article, we will take a closer look at OPPO A57 and analyze its design, display, camera, performance, and battery life. Design: OPPO A57 has a sleek and stylish design. It measures 149.1 x 72.9 x 7.7 mm and weighs only 147 grams. It has a metal unibody design with curved edges that make it comfortable to hold. The device has a front-mounted fingerprint sensor that can unlock the device in just 0.2 seconds. The fingerprint sensor is located on the home button, which also acts as a capacitive touch button for navigation purposes. The device is available in two colors, gold and rose gold. Display: OPPO A57 features a 5.2-inch IPS LCD display with a resolution of 720 x 1280 pixels. The display has a pixel density of 282 ppi and is protected by Corning Gorilla Glass 4. The display is bright and vivid, and the colors are accurate. The only downside is the HD resolution, which may not be suitable for users who want a higher resolution display. Camera: OPPO A57 features a 13-megapixel rear camera with an f/2.2 aperture, phase detection autofocus, and LED flash. The rear camera can record 1080p videos at 30fps. The camera app offers various modes such as HDR, Panorama, and Expert mode for manual controls. The front-facing camera is a 16-megapixel camera with an f/2.0 aperture. The front camera also has a Beauty mode that can enhance selfies by smoothing out the skin and adding makeup effects. Performance: OPPO A57 is powered by an octa-core Qualcomm Snapdragon 435 processor clocked at 1.4GHz. It has 3GB of RAM and 32GB of internal storage, which can be expanded up to 256GB via a microSD card. The device runs on Android 6.0 Marshmallow with OPPO's custom UI, ColorOS 3.0. The user interface is clean and simple, and OPPO has added some useful features such as the ability to split-screen multitask and gesture controls. Battery Life: OPPO A57 has a non-removable 2900mAh battery. The battery life is decent, and it can last for a full day with moderate usage. The device does not support fast charging, and it takes around 2 hours to fully charge. Overall, OPPO A57 is a good mid-range smartphone that offers decent features and specifications for its price. It has a sleek design, good display, decent camera, and smooth performance. However, the HD display and lack of fast charging may be drawbacks for some users.