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A button has several properties which are described below. It is not necessary that all buttons support all features. For example, it is possible that a phone has LED lights and keys, but no display associated with the button.


Lamp

One lamp can render one color at a time. It must have at least a "on" and an "off" state, and it may have additional features like colors. It has the possibility to indicate further information by slow and fast blinking. Typically, a lamp is implements with a LED diode.


Label

A key might have a small display next to it, called a "label". Some devices support this feature, so that the user does not have to print a label on paper for the key. This display can be used to provide additional information to the lamp, for example the extension number or the function of the key.


Key

The key has two states, up and down. The user can push the key and release the key. The key is associated with a lamp and typically located physically next to the lamp.


Key Information

Along with the key, the device may render additional information that belongs to the key. The device that renders the information is not attached to the lamp. For example, information could be the caller-ID for an incoming call and it is displayed on the main screen of the device.


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