INTRODUCE:Double-layer stainless steel material, 304 stainless steel inner layer material, double-layer vacuum, heat insulation and anti-scalding. Food contact materials, the outer 201 and inner 304 stainless steel, the inner liner is made of 304 food contact cable material, so that every time you drink water is safe and secure.LARGE SIZE FEATURE:Volume: 3 L / 105 OZkettle size: 17cm /6.7 in (Base diameter) * 33 cm / 13 in (height)X-LARGE SIZE FEATURE:Volume: 3.5 L / 123 OZkettle size: 17cm /6.7 in (Base diameter) * 36 cm / 14.2 in (height)XX-LARGE SIZE FEATURE:Volume: 4 L / 140 OZkettle size: 17 cm / 6.7 in (Base diameter) * 38 cm / 15 in (height)XXX-LARGE SIZE FEATURE:Volume: 4.5 L / 158 OZkettle size: 17 cm / 6.7 in (Base diameter) * 43.5 cm / 17 in (height)MATERIAL: Stainless steelINCLUDE:1 air pressure kettleINSTRUCTIONS FOR USE:1. Before use, please clean the bottle body and inner liner. Fill it with boiling water and let it stand for more than two hours, then it can be used after it is poured out.2. Press the button to pour water. If there is water leakage, please check whether the lid is tightened and check whether the waterproof silicone ring on the lid is off.3. The water should not be too full or too little. When it is too full, it will cause scalds due to hot water overflow, and too little will easily reduce the heat preservation performance.4. To achieve the best heat preservation effect, please add a small amount of hot water or ice water for preheating or pre-cooling for five minutes before use. Please be careful and slow to inject boiling water to avoid scalding from splashes of boiling water.5. The thermal insulation effect of this product depends on the ambient temperature and the temperature and volume of the boiling water poured into the bottle.MAINTENANCE METHOD:1. If you do not use this product for a long time,