Usb Rechargeable Electric Air Pump for 3d Printer Filament Vacuum Bag One-key Quick Pumping with Mul

The principle of vacuum preservation: items in a vacuum state are in a negative pressure and hypoxic environment, In order to isolate the and moisture in the air, the food in the vacuum state can be at room temperature,The time is 3-5 times that of non-vacuum state.Product name:New filterable USB electric vacuum machine (suitable for food vacuum bags, -keeping boxes, etc.)Colour:BlackMaterial:ABSSize:127x52x52mmPackage Contents:1 * Electric Air Pump1 * usb cableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.