The NAS’s three USB ports (one on the face panel and two on the back panel) can be used to connect storage devices, printers and UPSes. Only one printer is supported (in unidirectional mode). The UPS support service is far more interesting. The compatibility list shows quite a lot of models (not only from APC), but you have to choose your model manually. The NAS can track two parameters: current power mode and battery charge level. Any changes of status are written into the logs and sent as email notifications. You can specify a bottom battery level at which the NAS will shut down automatically. However, this feature is somewhat less valuable because you cannot make the NAS start up automatically when its power supply is restored. On the other hand, you can use scheduled power management for that purpose.
USB drives are mounted in the public folder USBhdd in subfolders named after their device names. This allows to work with multiple partitions on one HDD and connect devices via USB hubs. Writing is possible for FAT32 and EXT2/3 whereas NTFS can only be mounted in read-only mode. The max data-transfer rate you can achieve when accessing an attached USB drive via the LAN is 25MBps (when reading from FAT32). The speed is lower with NTFS and EXT3 – 10 to 15MBps. These results are rather average in comparison with other NASes.
The user manual mentions support for Wi-Fi USB-controllers but does not give detailed information about using them.