2.5" & 3.5" mDOCK KEYPAD SECURE 56425 The Freecom 2.5"/3.5" mDock Keypad Secure uses 256-bit AES Hardware Encryption to protect data that is saved onto any internal 2.5" or 3.5" HDD inserted into the dock. The keypad allows users to set PIN codes to access the encrypted data that is saved on the hard drives to keep it safe and secure. Everything saved onto HDDs through this docking station will be AES 256-bit encrypted, making you 100% secure. Housed in a high quality metal enclosure.