Very small and compact design. Fits to pocket. Easy to carry with you | DOD Military CAC USB Smart Card Reader for Government ID, National ID, ActivClient, AKO, OWA, DKO, JKO, NKO, BOL, GKO, Marinenet, AF Portal, Pure Edge Viewer, ApproveIt, DCO, DTS, LPS, Disa Enterprise Email etc. CAC Cards | Supports all OS: Windows 7, 8, 10, Linux OS, Apple macOS X | Reads national ID cards and sign digital signatures | Reads tachograph cards