note : this review be not to criticize the modem . it work fine . however , beware of purchase from seller ` portable Guy ' . the modem they ship I be `` new '' just 4 + year old . I could not get my laptop to reccognise the modem so I call Cisco . after give the operator the serial number I be tell the modem be so old they no longer support it and the manufacture warranty expire 26 month ago . thanks for the burn , a \*\*\*\*\* e.