Abstract: A HUD for a helmet having an image projector attached to a body and configured to project images. The HUD has a projection optical combiner configured to produce a transparent display of the images. A holder supports the combiner outside the helmet such that the images are visible to a user of the helmet when the head-up display is in use. A forward facing part of the combiner, such as the entire combiner or its forward facing portion, is user replaceable. A system that has the HUD and a spare user replaceable forward facing part and a system having the HUD and the helmet are additionally disclosed.

Abstract: A moveable functional element such as a keyboard is provided for use with a mobile communication device. The element is constructed in two wing portions. When the cover is swiveled between closed and opened positions, the wing portions move relative to the body of the device and the cover between two positions, a retracted position in which the functional element is hidden and an extended position in which the functional element of the device is exposed for normal use.

Abstract: An electronic device (1) comprises a control element (6) for receiving user input, and the control element (6) comprises at least a first input means (6b), a second input means (6c) and a protective cover (2) with a specified place for the control element (6). The first input means (6b) is essentially plane-shaped and the second input means (6c) is essentially ring-shaped; the control element (6) has a first input mode and a second input mode; in the first input mode, the control element (6) is arranged to receive input in the form of navigation information; and in the second input mode, the control element (6) is arranged to receive input in the form of alphanumeric information. The device (1) is arranged to be controlled by means of information received by the control element (6).

Abstract: A moveable functional element such as a keyboard is provided for use with a mobile communication device. The element is constructed in two wing portions. When the cover is swiveled between closed and opened positions, the wing portions move relative to the body of the device and the cover between two positions, a retracted position in which the functional element is hidden and an extended position in which the functional element of the device is exposed for normal use.