The Motorola DOCSIS 3 is a digital voice modem that serves a dual function. This Motorola modem provides the user with high-speed cable internet access and up to 2 lines of voice-over-IP or VOIP telephone service. The modem includes an AC power adapter, backup battery, installation instructions and an ethernet cable to connect it to the user's home computer. The backup battery enables the person to retain service for several hours during power outages. The voice modem connects to their existing cable internet via a standard coaxial cable connection. To use the VOIP capabilities of this Motorola modem, all the user has to do is connect a 1 or 2-line telephone via a standard telephone cable. They can establish phone service through their preferred VOIP provider or their cable internet provider. The Motorola DOCSIS 3 is compatible with Windows, Macintosh and Unix-based operating systems. In most cases, simply connecting the modem to the computer will establish a functional internet connection. The Motorola DOCSIS 3 is an ideal choice for cable internet and VOIP users, providing both services in a single reliable unit.