The Belkin 10-Socket Metal SurgeMaster is designed to protect equipment against power surges, lightning strikes and any other harmful electrical imbalances. The SurgeMaster features ten outlets and protects against power surges of up to 885 Joules in strength. Surges can occur between hot, neutral and ground lines; this unit protects along all three lines. An indicator lets you know when your equipment is protected at a glance. Additionally, the metal casing protects the interior circuitry of the surge protector against damage. The Belkin 10-Socket Metal SurgeMaster is backed by a lifetime warranty for peace of mind.