E-Pin Optical's USB memory drive with FingerPrint Protection FAQ - Frequently Asked Questions - Question and Answer - Q3: Can E-Pin's Optical FingerPrint sensor work on everyone's fingers? A3: The past research studies show about 7% of the population in the world can not pass the fingerprint sensor. These 7% are mostly young children, tenage students and seniors, due to the low pressure on the fingerprint and low recognizable linear on their fingers. E-Pin's Optical FingerPrint Protection USB drive is specially engineered and designed for professionals, such as: Lawyer and researcher Photographer Medical Notebook computer user Banking and financials Sales and marketing Government agency and official Majority of these users do not fall within the 7% of populations. Therefore this device remains to be a reliable optical fingerprint USB drive.