The Freecom 2.5" mDock Keypad Secure is a dual hard drive docking station that uses 256-bit AES Hardware Encryption to protect data saved onto internal 2.5" hard drives inserted into the dock. The keypad allows users to set PIN codes to access the encrypted data that is saved on the hard drive to keep it safe and secure. It has a two bay 2.5" hard drive dock - one for encryption and the other for unencrypted drives so you can use the dock in unencrypted mode if the data is not required to be protected.