| 摘要 |
<p>A printed article, such as a greeting card (1), comprises a substrate (2) formed of card, a sensor (6) for detecting exhaled breath directed at the substrate, the sensor comprising first and second spaced electrodes (12 1, 12 2) supported on the substrate, means for supplying a user-perceivable signal, such as light emitting diodes (7), and switching means (18) for causing the signal supplying means to supply a signal in response to detection of exhaled breath (19).</p> |
