Realme X3 smartphone comes with a 6.60-inch touchscreen display with a resolution of 1080×2400 pixels and an aspect ratio of 20:9. Realme X3 is powered by an octa-core Qualcomm Snapdragon 855+ processor. It comes with 12GB of RAM. The Realme X3 runs Android 10 and is powered by a 4200mAh non-removable battery. The Realme X3 supports proprietary fast charging. As far as the cameras are concerned, the Realme X3 on the rear packs a 64-megapixel primary camera with an f/1.8 aperture; a second 8-megapixel camera with an f/2.3 aperture; a third 12-megapixel camera with an f/2.5 aperture and a fourth 2-megapixel camera with an f/2.4 aperture. The rear camera setup has autofocus. On the front, the Realme X3 packs a 16-megapixel primary camera with an f/2.0 aperture and a second 8-megapixel camera with an f/2.2 aperture. The Realme X3 runs Realme UI based on Android 10 and packs 256GB of inbuilt storage. The Realme X3 is a dual-SIM (GSM and GSM) smartphone that accepts Nano-SIM and Nano-SIM cards. The Realme X3 measures 163.80 x 75.80 x 8.90mm (height x width x thickness) and weighs 202.00 grams. It was launched in Arctic White and Glacier Blue colours. Connectivity options on the Realme X3 include Wi-Fi 802.11 a/b/g/n/ac, GPS, Bluetooth v5.00, USB Type-C, 3G, and 4G. Sensors on the phone include accelerometer, ambient light sensor, compass/ magnetometer, gyroscope, proximity sensor, and fingerprint sensor. The Realme X3 supports face unlock.