The Nicolet Elite 100 Doppler is an audio only hand-held Doppler that is economical, compact, and comes complete with a built-in speaker. The comfortable shape of the Elite probe is easy to hold and features broad-beam technology, making it very easy to find and lock onto the signal of interest. Natus probe technology has been tested in obstetric applications for years and is effective in detecting fetal heartbeats as early as 8 weeks in most pregnancies.