Automatice Voltage Regulation: Monitors incoming AC power and cleans it to a nice smooth 120 vac. This eliminates dips and spikes by taking irregular AC and converting to a smooth waveform.

EMI/RFI - Provides shielding against electromatic interference like noisy motors and radio signals to prevent line noise and diminished humming in speakers.
Transformer Spaced Outlet - Widely spaced outlets to prevent larger power plug-in modules from covering up other outlets.

USB Connectivity: USB ports integrates power management and auto shutdown features.
Power Management Software: Saves and closes open files automatically upon loss of power, hibernates your computer to save power. Uses minimal system resources. Works with Windows, Linux, and Mac OSX.

Full Data Line Protection: RJ11, RJ45 for phone, fax, Ethernet, network, and DSL. RG-6 coax for DSS, cable modem, satellite, and cable TV.

BackUp Power Software Utility: gives you vital power statistics, visual feedback of power status, input & output voltage, automatic self test, adjustable high & low voltage warnings, event and data logging, and scheduled shutdowns. Upon a power failure it automatically saves and closes open files, and shutdowns the PC in an intelligent and orderly manner, with audible alarms, current AC voltage, runtime, renmaining battery power, estimated shutdown, and a detailed log file.

Voltage Range: 100 VAC to 140 VAC
Frequency Range: 57 Hz to 63 Hz
Voltage Regulation: Yes
Powered Output:
Apparent Power: 685 VA
Real(True) Power: 390 watts
LED Indicators: Power On, Wiring Fault
Audible Alarms: On Battery, Low Battery, overload
Included Software: Power Protection and Computer Power Management
Operating Temperature: 32 F to 104 F (0 C to 40 C)
On Battery Output
Voltage : 114 VAC to 126 VAC
Frequency: 60 Hz
Wavenform: Simulated Sine Wave
Runtime at Half Load: 10 mins
Runtime at Full Load: 2 mins
Battery Type: Sealed Lead Acid
User Replaceable; Yes
Typical Recharge Time: 8 hours
Surge Supression and Filtering
Surge Supression: 890 Joules
Maximum Surge Current: 36,000 amps
Overload Protection: Circuit Breaker, internal circuitry limiting
Outlets
Battery BackUp & Surge Suppression: 4
Surge Suppression Only: 4
Transformer spaced outlets: 4
Phone/Ethernet RJ11/RJ45: 1 in, 1 out combo
Coax Protection: 1 in, 1 out
Software Managemet Serial Port: Yes
Software Mangaement USB Port: Yes
Power Cord Length: 6 ft
Dimensions: 11.5" x 6.5" x 3.5"
Certifications: UL1778, cUL, FCC DOC Class B
Manufacturer Warranty
Product Warranty: 3 Years Limited
Connected Equipment Guarantee: Lifetime
CEG Amount: $125,000

The PW390 Battery BackUp is designed to deliver clean power to your computer, and have just enough battery power to turn your computer off in an orderly manner in case of a power failure. Don't expect to keep on working when power fails. That is available, but the price to have that capability goes up exponentially depending on how much power your system uses. The PW390 is a nice, affordable, compromise, and is highly recommended.