Voltage spike and transient protector. Two stage silicon avalanche device shunts overvoltage to ground. If first stage is removed by severe strike, second stage will continue giving protection. If a severe second strike occurs and removes the second stage, power will be disconnected from protected equipment. Flashing light signals first stage failure. Flashing light and no power output signals second stage failure. 6 ft line cord, (4) 115 VAC receptacles, lighted On/Off switch, indicator light, circuit breaker. 5 year warranty. Clamping 1st stage 200 VAC; 2nd stage 210 VAC. Response time is less than 5 nanoseconds.