1. Practicality: At room temperature, the water in the hot water bottle can stay warm for at least about 3 hours. Place it on the bed for ten minutes, and the bed will warm up. Put it inside the quilt, and the temperature will last all night. Let the hot water bottle warm your winter days. 2. Material of the hot water bottle: The inner container is made of 1.8 - liter rubber material, which is anti - aging and has 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. Place the hot water bottle on the bed before going to sleep, and it will soon create a warm sleeping environment for you. It is also a perfect gift. 4. Energy - saving and customer service: This hot water bottle is environmentally friendly and safe. It adopts a water - filling design with no leakage problem. We provide 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 allowed.