Key features and specifications of LG fully automatic washing machines may include:

1. Capacity: The F4WV312S0E model you mentioned has a capacity of 12 kg. This larger capacity allows you to wash larger loads of laundry at once, making it suitable for households with a higher laundry demand.

2. Fully Automatic Operation: LG fully automatic washing machines handle the entire washing process, including washing, rinsing, and spinning, with minimal manual intervention. You can simply select the desired wash program, add detergent and clothes, and let the machine do the rest.

3. Multiple Wash Programs: LG washing machines typically offer a variety of wash programs to accommodate different types of fabrics and laundry needs. These programs can include options for regular wash, delicate items, quick wash, heavy-duty cycles, and more.

4. Energy Efficiency: LG emphasizes energy efficiency in their appliances. Their washing machines often come with features such as energy-saving modes, inverter technology, or high energy efficiency ratings to help reduce power consumption.

5. Smart Features: LG has been incorporating smart features into their appliances. While I don't have specific information on the F4WV312S0E model, it's possible that it may have smart functionalities like Wi-Fi connectivity, remote control via a mobile app, or compatibility with voice assistants.