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The Kindle Keyboard was available in two versions. One of these, the Kindle Wi-Fi, was initially priced at $139 and connects to the Internet via Wi-Fi networks. The other version, called the Kindle 3G, was priced at $189 and includes both 3G and Wi-Fi connectivity. The built-in free 3G connectivity uses the same wireless signals that cell phones use, allowing it to download and purchase content from any location with cell service. The Kindle Keyboard is available in two colors: classic white and graphite. Both versions use an E Ink "Pearl" display, which has a higher contrast than prior displays and a faster refresh rate than prior e-ink displays. However, it remains significantly slower than traditional LCDs.  An ad-supported version, the "Kindle with Special Offers", was introduced on May 3, 2011, with a price $25 lower than the no-ad version, for $114. On July 13, 2011, Amazon announced that due to a sponsorship with AT&T, the price of the Kindle 3G with ads would be $139, $50 less than the Kindle 3G without ads.