• Protects TVs and refrigerators from voltage fluctuations (over voltage and voltage sag). • Suitable for 220V AC, 50Hz circuits. • Automatically cuts off power during voltage surges and sags, preventing damage. • 30-second automatic recovery delay prevents damage from frequent power cycling. • Features working status indicator: Green (on), Red (protection), Yellow (delay). • Made with 750°C high-temperature resistant and flame-retardant enclosure. • Uses 0.7mm thick beryllium bronze components. • Incorporates a domestic top-brand high-quality relay.