Comments about APC Smart-UPS® SC 620VA 4-Outlet UPS:
This is not apparent on the description - the communication for this device is by SERIAL PORT ONLY. Do not buy this unit if you have a PC with only USB ports for commuications (as most new PC's are). If you get this unit and you do not have a serial (RS-232) port, you will not be able to commuicate with and control the PC in case of a power outage (i.e. shut the system down gradefully when the unit senses a power outage). You can buy a USB-to-serial conversion adapter, but this costs another $20 and you will still have to use the software supplied with the unit (Powerchute) instead of the WIndows power monitoring service. I bought this particular UPS because of the form factor - it fits perfectly into our HTPC cabinet.