I buy this to replace the lease modem -lrb- also DOCSIS 3.0 -rrb- from Charter . it provide equivalent performance , and you will save $ $ $ every month . no technical skill be require to install . write on paper the MAC address from the label on the back of the new modem . disconnect the old Charter modem and attach the coaxial internet cable to the new modem and plug modem into a electrical outlet -lrb- consider use a surge protector -rrb- . call Charter support to activate the new modem . the service technician will need the MAC address that you write on the paper . the whole process will take about 10 minute . Performance be great . I have have no problem with the modem . the speed usually exceed my 30\/3 service .