The new BLACK BOX DSL Surge Protector guards your sensitive 6-wire RJ-11 DSL data lines against lightning-induced surges, AC power interference, electrostatic discharge (ESD), and ground loop energies. State-of-the-art high-speed avalanche diode and thyristor technology is used in conjunction with low-shunt capacitance circuitry. These enable the protector to function at a much greater bandwidth without causing signal degradation. Installation is simple. Just insert the unit in series between the incoming data line and the 1/0 port of the device being protected. A self-resetting circuit means no maintenance is required. For affordable, reliable, and superior protection, choose the DSL Surge Protector.