The iPad 2 is the second generation of the Apple tablet and was launched in March 2011. The screen has a 9.7 inch diagonal and a resolution of 1,024 x 768 pixels. The case is made of aluminum, but at 8.8 millimeters thick, it is nearly 5 millimeters thinner than the iPad 1. The amount of RAM was doubled to 512 MB in the second generation iPad. The iPad 2 has both a rear and a front camera and a microphone for video conferencing. The standard version supports Wi-Fi and a 3G wireless module is available for a surcharge.