Sony Xperia Acro S has a 4.3 inch scratch-resistant TFT touchscreen. It is powered by a 1.5 GHz Qualcomm Dual Core processor. It comes with a 12.1 megapixel camera with auto focus and 16x digital zoom, LED flash. At the time of its release it ran on the Android 4.1 Jelly Bean OS. It was one of the first device to have the Sony branding.
Sony Xperia Acro S is not listed by Sony to get the Android 5.0 Lollipop update. Its not a surprise as it in an old device. You can install Android 5.0 manually on this device via the AOSP custom ROM. It has some bugs but you can still use it. Follow the guide given below.