Your network/phone line is vulnerable to surges and power problems. These connections provide one more entry-way for transient surges to damage your equipment. Seal off your equipment from potential damage by stopping transient surges with the DataShield™ DTEL2 Network Surge Suppressor. It protects up to 2 network or phone lines, modems, fax machines, and answering machines against damage from lightning, electrostatic discharge, and ground surges.