1. Practicality: At room temperature, the water in the hot water bottle can stay warm for around 3 hours or more. Placing it on the bed for ten minutes can warm up the bed. Putting it inside the quilt, the warmth may last all night. Let the hot water bottle bring warmth to your winter days. 2. Material of the hot water bottle: The inner container is made of 1.8 - liter rubber material, which has anti - aging properties and relatively long - lasting heat retention. The plush outer cover of the hot water bottle is soft and comfortable. 3. Multi - scenario use: It can be used to warm hands, neck, waist, back, etc. Placing the hot water bottle on the bed before going to sleep can create a warm sleeping environment for you. It can also be a nice gift. 4. Energy - saving and customer service: This hot water bottle is environmentally friendly and safe. It adopts a water - filling design with little risk of leakage. We offer friendly customer service. If you have any product - related questions, please contact us. 5. Materials: Rubber + Plush 6. Color: Dark gray 7. Package contents: - 1 hot water bottle Only the above items are included in the package, and other items are not included. 8. Precautions: Light reflection and different monitors may cause slight differences between the color of the item in the picture and the actual product. A measurement error of plus or minus 1 - 3 centimeters is acceptable.