NOTE: Every items is high quality tested earlier than we bring it out, There are just about a machines that aren't working. If it's a quality problem, we are able to actually refund. If the machine would not work, please stick with steps under to examine whether or not or now not use of the proper formulation ①Is bag positioned in sealing opening Are either side of machine pressed tight. If only 1 aspect is loose, it won&;t have the power to seal and vacuum because it has gaps! ③This mechanical device doesn&;t help tender bags, it must use dotted bags Most people suggestions that mechanical device would not paintings thanks to wrong way to apply it. If machine doesn't work, please send video to visitor service, we will intently examine your video to examine problem, at the identical time, if you are confused, you can touch customer service to ship a utilization video