The Sony Xperia Z2 is an Android-based smartphone unveiled, manufactured, and marketed by Sony and was released in April 2014. Under the codename "Sirius", Xperia Z2 serves as the successor to the Sony Xperia Z1. Like its predecessor, the Xperia Z2 is water and dust proof with an IP rating of IP55 and IP58. The phone features an IPS LED display, a Snapdragon 801 processor and the ability to record 4K videos. The Xperia Z2 also allows removable microSD storage up to 64GB. The Xperia Z2 was unveiled alongside the Sony Xperia Z2  4 GB RAM/64 GB and the Sony Xperia M2 during the 2014 Mobile World Congress in Barcelona, Spain, on February 24, 2014, and was first released in Taiwan on March 24, 2014, in Singapore on April 5, 2014, and entered more markets between April and May 2014. In the United States, the Xperia Z2 was released unlocked through the Sony Store on July 21, 2014. Many reviewers praised the phone's screen, camera and waterproof design, but criticized its size and camera software issues that cause the device to overheat when recording 4K video for extended periods. Wikipedia