With the awesome black colour now O2 Xda Zest is loaded with the best features like 3.15 mega pixel camera which has added with Auto focus, to have the standard photo during dim light. It also avails the video calling facility with the help of VGA video call camera. It runs on the Microsoft Windows Mobile 6.1 Professional and is officially powered by Marvell TavorP -624MHz processor. The battery has the back up of 5hours during talk time and 260 hours in stand-by mode. The battery used is Li-Ion 1300 mAh which is the best in its own section. It has the compatibility of supporting both the networks the 2G and 3G. It just 16.5 mm thick in size has an attractive look and just weighs 102.5 grams. It has a display of 2.8inches wide and filled with wonderful 65000colours. Photo call facility is facilitated with unlimited entries in the phone book.