The Nikai 190L Double Door Refrigerator with Vegetable Crisper, model NRF190DN4S, appears to be a specific refrigerator model from Nikai. Here are some common features and specifications you might expect from this type of refrigerator:

1. Capacity: The refrigerator has a total capacity of 190 liters, which includes both the refrigerator and freezer compartments.

2. Double Door: This refrigerator has two separate doors, one for the refrigerator section and one for the freezer section. Double door refrigerators are designed to help you maintain different temperature settings for the two compartments.

3. Vegetable Crisper: The inclusion of a vegetable crisper typically means that there is a dedicated drawer or compartment designed to keep your fruits and vegetables fresh and crisp for a longer time.

4. Shelves and Compartments: Expect adjustable shelves, door compartments, and drawers to help you organize and store your groceries effectively.

5. Freezer Compartment: The freezer compartment is separate from the refrigerator section and is usually located on the top or bottom, depending on the design.

6. Temperature Control: You should be able to adjust the temperature settings for both the refrigerator and freezer sections.

7. Defrosting: Depending on the model, it may have manual or automatic defrost features to prevent ice buildup in the freezer.

8. Energy Efficiency: Many refrigerators, including this one, are designed to be energy-efficient.

9. Dimensions: Check the refrigerator's dimensions to ensure it fits in your available space.