This machine needs to be connected to an air compressor for use, which is purchased by the buyerModel recommendation: Power: 1000WCapacity: 60L The latest upgraded drip system is suitable for a variety of objects, easy to operate, anti-drip and better sealing effect Spiral propelling mixing hopper, no residue. Avoid blockage due to particulate matter in the material. The width of the bag is 1-10cm, the width of the bag is fixed and cannot be adjusted.Bag length size: 1-16cm, the length of the bag can be freely adjusted within the range. The machine can make two types of bags: three-side sealing and back-sealing, and three-side sealing type bags are sent by default. If you need a back seal bag, please contact me.syi