Users can easily manage data by networking U400 via RS232/485, TCP/IP, USB Client. Most importantly, all the functions can still operate in a networking state. U400 is compatibility with various types of USB flash disks, ADMS and former SDK. It also supports data backup and retrieve to avoid the risk of accidental deletion. It promotes the fingerprint time & attendance management to the next level. You can get the best of benefits from the U400.