Amazon announced a touchscreen Kindle, called the Kindle Touch, on September 28, 2011, available with Wi-Fi or Wi-Fi/3G connectivity. Via 3G the device is able to connect to the Kindle Store, download books and periodicals, and access Wikipedia. Experimental web browsing (outside Wikipedia) on Kindle Touch 3G is only available over a Wi-Fi connection. The usage of the 3G data is limited to 50MB per month. The device uses the same 6 inch E-ink screen of the previous Kindle model, with the addition of an infrared touch-screen control. Like its predecessor, the Kindle Touch has a capacity of 4 GB and battery life of two months under ideal reading conditions. The Kindle Touch began to ship on November 15, 2011. The Touch was the first Kindle to support X-Ray, which lists the commonly used character names, locations, themes, or ideas in a book.