Compared with the smaller Liquid Z3 Duo, Acer has barely modified the Liquid Z4 Duo. The screen's size has grown by half an inch to four inches. The resolution has been more than doubled, and is now 800x480 pixels. Both the processor and graphics unit are identical. MediaTek's MT6572 now clocks faster, and achieves up to 1.3 GHz. The working memory capacity is only 512 MB. Anyone hoping that Acer at least uses Google's hardware-friendly 4.4 KitKat will be disappointed. Like in the precursor, Google's Android 4.2.2 Jelly Bean is installed on the 4 GB flash storage.
The review sample is positioned between the older Z3 (3.5 inches) and the new Z5 (5.0 inches) so that all common screen sizes should be covered in the Taiwanese manufacturer's entry-level sector. But those are the biggest differences of the smartphones. Its contenders are Huawei's Ascend Y300, Y330 and Y530, Sony's Xperia E Dual, ZTE's Blade III, Samsung's Galaxy Fame, andNokia's Lumia 520.
