Note:The rebound of the large button does not affect the vacuum effect. Please try pressing the small button after vacuuming. If there is a sound of air release, it indicates that the can is in a vacuum state. If any problem, please contact us! Feature: 1.The lid of this coffee canister with a vacuum pump has a built-in vacuum valve that reduces the air inside the jar by 60%, which is good for keeping food fresher for longer. 2.Just press the vacuum pump button in the center of the lid a few times to expel air until the button is about 5mm above the surface of the lid; press the small button next to it to let the air in, so the jar can be opened. 3.This stainless steel coffee jar can store not only coffee beans or coffee grounds, but also dry tea leaves, nuts, grains, flour, sugar, and more to keep your food in its best flavor. 4. Protect your food by storing your coffee beans in vacuum-sealed food storage jars to keep your coffee beans fresher for longer; simply pump the lid to vent the air inside; this limits oxygen exposure and helps keep your coffee from spoiling 5. Airtight to keep your coffee or snacks free from contamination, this is a completely sealed food can with a strong silicone ring to stop air, moisture, odors and other smells from seeping in; it will stay sealed for up to a month if left unopened 6. Superior quality keeps your dry goods safe in food storage containers made of food-safe PP; hand wash canisters as integrated vacuum pumps are not dishwasher safe 7. Unique Storage ContainerThe minimalist design of this food saver not only adds a simple modern touch to your kitchen countertop and pantry; it's also a great helper for keeping food and coffee outdoors and on the go! Description: Name: vacuum sealed tank Color: Transparent Size: 10*10*9.5cm(500ml) 10*10*13cm(900ml) 10*10*17cm(1200ml) 10*10*22cm(1800ml) Temperature resistance: bottle body -20 ℃-300 ℃, bottle cap 70 ℃ (please remove the bottle cap for high temperature heating) Material: high borosilicate glass bottle body, food grade PP bottle cap, silicone sealing ring