By pressing the sensor on its head for approximately 3 seconds, it turns from orange to green and the device automatically regulates the brightness of the LED according to the quantity of light present on the desk. The brighter the ambient light is, the less light will be emitted by the device and vice-versa.
![Antonio Citterio](https://dm4c9mjc2jvtf.cloudfront.net/associated-media/UBJ/500/500/antonio-citterio.jpg)
Italian architect and designer Antonio Citterio was born in Milan in 1950.
Since 1972 he has worked with Italian and internationally renowned design companies such as Ansorg, Artemide, B&B Italia, Flexform, Flos, Hackman-Iittala, Kartell, Maxalto, and Vitra, as a product and industrial designer.