No need of compressed air (connect electric only) Useful office, laboratory, small shop, etc. (Quiet) Use STS 304 / Useful in the cleanroom Low price, compact size and simple to use Output DC 24V: electrically stable Model Very easy to maintenance Vacuum packing: 1,500 times/day (A4 Size) Sealing Length: 350mm Detachable work tray with height adjustable by 15cm Option: gas flushing, up & low heat wire, vacuum pump upgrade, emergency switch