When you are pregnant, your body produces the pregnancy hormone, hCG (human Chorionic Gonadotropin). Levels of hCG continue to increase rapidly during pregnancy. Surearly Digital Multi-Use Pregnancy Test detects hCG in urine to aid in the early determination of pregnancy. There is no need to interpret the confusing lines by your naked eyes. Its smart digital system gives you greater certainty in performing and reading your pregnancy test by telling you in easy-to-read words (YES/NO) on the display in about 3 minutes. "YES" indicates that the pregnancy hormone (hCG) was detected (Pregnant). "NO" indicates that no hCG was detected (Not Pregnant).