A car vacuum cup is a type of insulated cup or mug designed for use in vehicles, particularly for keeping beverages hot or cold during travel. It typically features a vacuum-sealed design that helps maintain the temperature of the drink for extended periods. Here are some key features:

1. Vacuum Insulation: The main feature is its vacuum-sealed design, which creates an insulating layer between the inner and outer walls of the cup. This helps keep hot drinks hot and cold drinks cold for hours.

2. Travel-Friendly Design: Often designed to fit into car cup holders, making it easy to carry your drink while driving.

3. Leak-Proof Lid: Most car vacuum cups come with a secure, spill-resistant lid to prevent leaks and spills while on the move.

4. Durable Material: Typically made from stainless steel or other sturdy materials that are resistant to corrosion and impact, making it durable for everyday use.

5. Easy to Clean: Many models are dishwasher safe or have removable parts that make cleaning easier.

6. Portable: Light and compact enough to be easily carried around, perfect for commuting or long road trips.

Overall, a car vacuum cup is a practical and convenient solution for enjoying beverages at the right temperature during travel or while on the go.