Comes with 3 different settings,  vacuum and seal, seal only, vacuum only.
 Practice before with small things so you can get it  right. Test seal, run finger along inside with a little pressure to see if will separate to know if holding sealer closed long enough   before putting food in, to seal for storage .
Not only seal food, but you could seal nuts and bolts, washers,  small screws, any thing you can put in the bags you make.