Auto-Operated Efficiency: Our mason jar sealer boasts an intelligent auto-function, detecting and completing the sealing process when pressure reaches zero, unlike market alternatives that rely on pre-set time estimates. Universal Compatibility: The vacuum sealer for mason jars is ingeniously designed to fit both standard 2.76-inch and wide-mouth 3.39-inch jars, offering exceptional versatility. Enhanced Durability with Upgraded Silicone Ring: Addressing common issues in the industry, our automatic electric vacuum sealer ensures a firm grip with its improved silicone ring, eliminating rubber detachment or deformation that can compromise vacuum sealing after multiple uses. Streamlining Kitchen Efforts: Compared to traditional food savers, our electric mason jar sealer saves precious time, effort, and storage space, catering perfectly to the needs of every household. Simplified Experience: Introducing the user-friendly, digital display-equipped electric mason jar vacuum sealer kit Material: plastic colour: Black Package Contents: 1 x sealing machine 1 x bottle opener 10 x sealing caps (5 large + 5 small) 6 x stickers Only 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.