The ThinkPad X120e was released in March 2011. The laptop won Best Affordable Business Ultraportable at CES 2011. The laptop's specifications are given below. The ThinkPad X220 was released in April 2011 with a new thinner, latchless case and a 16:9 screen. "LAPTOP Magazine" received the X220 positively. It was praised for its battery life, performance, low weight, display, keyboard, and significantly improved temperature control. However, the web camera did not receive favor—while images were crisp and clear, colors were reported to be muted. Engadget said the "all-too-familiar ThinkPad can deceive you with its boring business looks, but it's arguably one of the best laptops we've ever tested". Notebook Review was of the same opinion, stating that the "ThinkPad X220 is quite simply the best 12-inch business notebook we've reviewed so far." The laptop's specifications are given below:  The X220i uses the same motherboard and chipset as the standard X220, but has a less powerful Intel Core i3 processor, compared to the i5 and i7 options available for the X220. As another cost-reducing measure, the X220i was not offered with an IPS display option. The X220 tablet was also released in April 2011. It offered the same specifications as the X220 laptop in terms of processor, graphics, and RAM. The battery life on the X220 tablet was up to nine hours with a 6-cell battery and up to 18 hours with an external battery pack and a 6-cell battery. The starting weight of the tablet was 3.88 lbs. An addition to the lightweight X series, weighing between 1.36 kg to 1.72 kg depending on configuration. It was the thinnest ThinkPad laptop to date at 16.5 (front) and 21.5 mm (rear). The screen is a LED-backlit HD infinity panel with (WXGA) resolution. Base configuration uses an Intel Sandy Bridge 2.5 GHz Core i5-2520M (up to 3.20 GHz) with 4 GB of RAM (up to 8 GB), SATA SSD or hard drive, Intel Integrated HD Graphics, USB 3.0, backlit keyboard, 802.11 b/g/n WiFi and an average of eight hours of battery life. The battery is internal and not removable, and there is no optical drive. The ThinkPad X1 laptop was released by Lenovo in May 2011.