Excellent protection against breaking grounded metal pipes, conduit and reinforcement steel while drilling concrete walls and slabs. Simply plug your drill into the Protek II. When the drill bit encounters grounded metal pipes, conduit, rebar, or anything conductive, power to the rotary hammer is interrupted and the drill stops instantly. The Protek II has sturdy cast aluminum housing and extra heavy-duty circuitry to withstand rugged jobsite conditions. Built-in Ground Fault Interrupter (GFCI) also included. The 13 amp model is for standard electric hand held tools such as rotary hammers. 110-120 volts. Size: 7 1/2" x 4 1/2" x 3". Weight: 4 lbs.