【Home Appliance Surge Protection】 Protects your refrigerator and other essential appliances from voltage spikes, power surges, power outages, and unstable current caused by high or low voltage. This surge protector helps prevent costly damage and extends the lifespan of your electronics. 【Automatic 30S Delay Function】 Features an intelligent delay start system that activates during voltage fluctuations or power interruptions. It safely delays the power supply for 30 seconds, allowing voltage to stabilize and avoiding damage from sudden power restoration. 【Reliable Voltage Monitoring】 Built-in microprocessor continuously monitors real-time voltage conditions. Automatically cuts off power during over-voltage or under-voltage situations and resumes operation only when safe voltage levels are restored. 【Clear LED Status Indicators】 Equipped with LED lights to indicate real-time working status – Normal, Delay, Over Voltage, and Under Voltage – helping users easily monitor the protection status of their appliances at a glance. 【Wide Compatibility & Heavy-Duty Use】 Designed for refrigerators, air conditioners, freezers, washing machines, ice makers, water pumps, and more large household appliances. Ideal for homes, offices, kitchens, and rental properties that require surge and voltage protection. 1.Over/Under Voltage Protection: When the voltage exceeds the limit, it will automatically cut off the power to prevent the electrical appliances being damaged for too low or too high voltage.