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. Power outages and sudden re-energizing of the electrical network 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 power outlet, then connect the appliances such as 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 conditioner, refrigerator, freezer. Note: Do not install the protector in areas exposed to high temperature or moisture. Operating the device in dirty environments or with oxidized plugs may lead to premature failure. Specifications: 220V, 50Hz, 110V, 60Hz; Voltage range: 90±3%–130±3% (60Hz), 180±3%–250±3% (50Hz); Current rating: up to 16A; Start-up delay time: 180 seconds; LED/LCD display shows working voltage and status; Provides 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 TV, LCD, Plasma, DVD, home theater systems, PC, laptop, washing machine, refrigerator, dryer, oven, dishwasher, and other household appliances without compressors.