The Bio-Key Sidetouch Compact Fingerprint Reader is a high-quality device tested and qualified by Microsoft for use with Windows 8.1 or 10 and 150 MB of disk space. With its compact design and convenient side-touch feature, this fingerprint reader offers a secure and user-friendly way to protect your computer and personal data. The brand, SideTouch, ensures reliability and performance in this essential anti-theft accessory for laptops and desktops. Model: CTTFD2500 Box has been opened but it has not been used. Please see photos.