We have many kind of models.each have different specification and price.for example ,we have UPS-350N,UPS-500N,UPS-650N,UPS-1000N,FAX UPS.You can look them in our web:

http://www.hongdaelectric.com/bidai/show6%2B%2B.asp?cpfl=UPS

the faxups's specification is:

Fax UPS is an automatic power supply that provides hours of power
to fax machines during power failures. On stand-by mode when fax
machine is not in use (stand-by light flashes to
indicate stand-by mode). Monitors the fax line
constantly for activity. Immediately an incoming
fax message is detected, it will automatically power up the
fax machine. After the message has been received, it will
power down the system and wait for the next incoming fax.