Illuminated switches are particularly effective in low light environments. Illumination also helps to identify the control unit to the user. The majority of the range have either single or bi-colour independent illumination from bulb and LED sources. LED's are an efficient and economical light source due to the low current draw and long life. Independent circuits for the illumination allows the installer to wire directly to the monitoring of an electric lock or other control devices, the switch then forms two functions, activation and providing visual indication of a state change. Switches can be wired in numerous ways, illumination can be constant, comes on or goes off when the button is pressed. This state change provides the user with positive feedback. Switches are available with either a momentary or maintained contact.