The most common functions of mobile devices involve alerting the user. Whether it is about notifying incoming calls and messages or about reminding of meetings, the system has to catch the users' attention. This causes undesired interruptions for those surrounding the users, and in some circumstances even for the users to which the notification was addressed.

A low resolution display is embedded in pair of standard eyeglasses to deliver notification cues in a private, subtle and non-obtrusive way. The display is composed of two arrays of four small LEDs, each placed at the end of the arms near the lens. The LEDs are lit (at very dim intensity) to display moving patterns in the wearers' peripheral vision. The peripheral visual cues are an alternative to ringing and vibrating alerts. They have the advantage of being very private and unobtrusive: only who wears the glasses sees them. An initial study revealed that because they sit in the periphery, the cues do not suddenly distract the user and that the level of disruption of the display can be tuned.

The display is connected via Bluetooth interface to standard mobile devices (drivers for Symbian UIQ and Series60 phones were developed).

A paper describing the system and its evaluation was published in the proceedings of the Mobile HCI 2006 conference.