The Asus Eee Pad Transformer TF101 is an Android based tablet with a 10.1" display. The Transformer is not available with 3G or 4G connectivity, leaving only a Wi-Fi model that does not require a data plan. Capacity sizes vary with both a 16 GB and a 32 GB version. Asus offers a docking keyboard as an optional accessory. This keyboard uses the Eee Pad Transformer to mimic a laptop. The dock has a full keyboard, trackpad, two USB 2.0 ports, an SD card reader, and an additional battery to extend the battery life to 16 hours.