This voltage protector provides automatic protection for home appliances against under-voltage, over-voltage, and power interruptions. If the supply voltage is too low or too high, it may affect normal operation, reduce appliance lifespan, or damage compressor motors in air conditioners, refrigerators, and freezers. Sudden power outages and reconnections can create strong voltage surges that are harmful to compressors. This device automatically disconnects the load and provides a delayed restart to protect the compressor. Applications: Plug the protector into a wall outlet, then connect the air conditioner, refrigerator, or freezer into the output socket of the protector. The unit can be mounted on the wall using the built-in hanging hole. Compatible devices include air conditioners, refrigerators, and freezers. Usage notes: Do not install in areas exposed to high temperature or moisture. Avoid use in dirty environments where plug oxidation may occur, as this could lead to premature damage. Specifications: 220V, 50Hz and 110V, 60Hz models available; voltage range: 90±3%–130±3% (60Hz), 180±3%–250±3% (50Hz); current rating: up to 16A; startup delay time: 180 seconds; LED or LCD display shows operating voltage and status; offers five types of protection including over-voltage, under-voltage, power interruption, surge/spike, and overload protection. Product dimensions: 5.2 x 9 x 3.5 cm. Suitable for use with TVs, LCD and plasma displays, DVD players, home theater systems, PCs, laptops, washing machines, refrigerators, dryers, ovens, dishwashers, and other household appliances without compressors.