... ,use for many years.It is normal to use even temperature less than -40ºC in cold area. Ignition time: 6 second ... oil one time.Safety,no toxic, environmental protection.How to use:1.open the cover of warmer2.put it up lightly.Don’t ... .Keep warm:suits for that go to school,travel,outdoor work,work on night,work in sea,guard,stand guard, mountaineering,go ...