The user's face must be within 30 centimeters of the device for two seconds. It buzzes an alarm if the temperature is higher than normal.
Since there is no touching required, the device is considered useful to fight the spread of influenza and other diseases. It also displays the time and room temperature when idle.
The device uses the same mechanism as thermographic imaging sensors used at airports to screen arriving passengers for signs of fever.
The thermographic machines used at airports read a full human figure and cost around 1 million yen ($12,000), while NEC Avio's Thermo Mirror costs much less at 102,900 yen and 126,000 yen, including tax.