E-Pin Optical's USB memory drive with FingerPrint Protection FAQ - Frequently Asked Questions - Question and Answer - Q4: Why your fingerprint sensor only accepts +/- 15 ¢X , can not accept 360¢X ? A4: To save time in the program execution process and and make this a more efficient product, this device is designed and programmed to accept fingerprint at +/- 15 ¢X .