Keyboards are connected to computers to input data and commands to the computers, so computers can deal with a lot of information. Computer keyboards have become standardized in their basic format for use with a variety of computers and computer operating systems. In general, a keyboard includes a standard set of printable characters (standard keys) and a number of non-text keys. Each of the standard keys functions itself, namely, each means something itself. On the other hand, the non-text keys are always used together with some of the standard keys. Most computer keyboards are made up of keys, each with a cap and an underlying key post, and a detection mechanism that registers that a key has been pressed. A number of key switches corresponding to the keys are arranged in matrix on the intersections of drive lines and receive lines. The keyboard is provided with a microcontroller which performs predetermined processing in response to key press and key release operations. By pressing a key on the keyboard, the keyboard generates a "make" code which is transmitted over the cable to the computer. Releasing the key generates a corresponding "break" code which is sent over the cable. The keyboard used with a desktop computer typically contains a keyboard controller which responds to the depression of a key on the keyboard by generating a key matrix code corresponding to the depressed key, and by supplying the code in a digital form to a host computer. In order to make notebook computers convenient, most notebook computers have keyboards directly installed on the notebook computer main body. The keyboards thus constructed cannot be adjusted to a desired usage angle. Computers typically utilize keyboards that are physically connected to the computer by a cable. The wired keyboard has proven to be very reliable and perform very well. However, on consideration of convenience, wireless keyboard are popularly used with various computing apparatuses, e.g., desk-top computers, notebook computers, personal digital assistants, mobile phones, and pocket computers. Click here for further details.