Also buy a automatic pump. I almost never post reviews but I feel I have to with this one. Maybe they just need a little time. I also like that this one has a 12 month warranty. Tip though, if you end up with one a bit too big, use the elastic straps that come out from the back over the front straps Velcro and it will hold it down for you where it doesnt stick. It has DPI switches at the top which range from 1000, 2000, 4000, 8000 and 16000. By comparison the DT770 are slightly slower in the highs yet have a very very prominent sibilance spike - making the high freq response wavy, not settled; the DT1990 dont have the sibilance issue - so do win out. The audio quality is "good", but you may find better. I ordered a half size up so that the arch would hit at the correct spot on my foot and that worked perfect. Nice, simple design that makes spice jars labels easier to see ( and access) vs other products.