http://www.biosmagazine.co.uk/article.php?id=1979
"AuthenTec utilises its TruePrint technology, which makes its sensors practical for nearly every device and capable of reading virtually any finger. With TruePrint technology, AuthenTec's sensors are able to read fingerprint patterns from everyone, under a wide range of conditions. AuthenTec's sensors are apparently the only ones in production that use small radio frequency signals to detect an image of the fingerprint ridge and valley pattern underneath the surface of the skin, to the live layer below."
