Design

The ASUS ZenFone 4 features physical body dimensions of 124.4 mm in length and 61.4 mm in width, with a variable thickness that tapers from 6.3 mm at the edges up to 11.2 mm at its thickest point. The smartphone weighs 115 grams and is constructed with a plastic casing that was offered in Charcoal Black, Pearl White, Cherry Red, Sky Blue, and Solar Yellow. The chassis houses a dual-SIM tray configuration, which accommodates dual Micro-SIM cards operating on dual stand-by networks.^[4]

Hardware

The device runs on an Intel Atom Z2520 system-on-chip, which integrates a dual-core processor running at 1.2 GHz alongside a PowerVR SGX544MP2 graphics processing unit. Memory configurations include 1 GB of RAM paired with either 4 GB or 8 GB of internal storage, which can be expanded further via a dedicated microSDXC card slot. Power is supplied by a user-removable Lithium-Polymer battery, which came in a 1170 mAh capacity.^[5]

Display

The handset features a 4.0-inch TFT capacitive touchscreen display with an approximate 59.6% screen-to-body ratio. It outputs a resolution of 480 x 800 pixels using a 5:3 aspect ratio, providing a pixel density of roughly 233 pixels per inch. For durability against scratches and daily wear, the display panel is shielded by Corning Gorilla Glass 3.

Cameras

For photography, the rear configuration consists of a single 5-megapixel primary camera that features autofocus capabilities. This main camera supports high-definition video capturing up to 1080p resolution at 30 frames per second. The front side of the smartphone includes a basic secondary camera capable of capturing casual selfies and accommodating video calls.

Software

The ZenFone 4 originally shipped with the Android 4.3 Jelly Bean operating system, which was layered with Asus's custom ZenUI user interface.^[3] The user interface was later made officially upgradable to Android 4.4 KitKat in October 2014^[6] and Android 5.0 Lollipop in June 2015.^[7]

The pre-installed software suites utilize the hardware's onboard hardware sensors, which include an accelerometer and a proximity sensor.