This is a voltage protector designed for automatic protection of 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 service life, or damage compressor motors in air conditioners, refrigerators, and freezers. Sudden power outages and restarts 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: Insert the protector plug into the wall socket, then connect the plugs of the air conditioner, refrigerator, or freezer into the output socket of the protector. The unit can be mounted on the wall using the hanging hole located on the back.Compatible devices: Air conditioners, refrigerators, freezers.Note: Do not install the protector in areas exposed to high temperature or moisture. Avoid use in dirty environments where dust and oxidation may cause premature damage.Specifications: - Voltage: 220V, 50Hz; 110V, 60Hz - Voltage range: 903%1303% (for 110V systems); 1803%2503% (for 220V systems) - Maximum current: 16A - Start-up delay time: 180 seconds - LED/LCD display shows real-time voltage and operating status - Provides five types of protection: over-voltage, under-voltage, power interruption, surge/spike, and overload protection Product dimensions: 5.2 x 9 x 3.5 cmSuitable for use with TV, LCD, Plasma, DVD, home theater systems, PC, laptop, washing machine, refrigerator, dryer, oven, dishwasher, and other household appliances without compressors.