IBM ThinkPad ThinkLight: Paperback, 132 pages

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. ThinkLight is a keyboard light produced by Lenovo, and is present in most ThinkPad families of notebooks. A white or yellow LED (depending on model) is located on the top edge of the display, illuminating the keyboard to allow use in low-light conditions. It is activated with the key combination Fn-PgUp (the bottom left and top right keys of the keyboard). The on-screen display of ThinkPad computers will display a light on and a light off indicator. The ThinkLight can be activated when the monitor is on or off but not while the PC is off. Some ThinkPads, like the Z and R series (though not all - some R61 and R32 models still have the white light) feature an amber (yellow) LED due to the lower cost, while other models, like the T series, use a white LED (which is generally preferred).