Airtight seal - Create airtight seal and prevent your food from tasting bland and stale and lock in freshness and flavor. Also safely pack cosmetics when traveling. Professional Heat Sealer will easily reseal original plastic bags so food will stop being exposed to dust and bacteria. Store food in original packaging 7 help save the Earth. Designed with ease to use in mind - Place edge of poly or mylar bag in your sealer ans slowly pull the bag through. Batteries not Included Notice: Please use only Alkaline Battery ( Example : Dura cell )