... one time.Safety,no toxic, environmental protection.How to use:1.open the cover of warmer. 2.put it up lightly.Don’t touch ... sleep,etc.Keep warm:suits for that go to school,travel,outdoor work,work on night,work in sea,guard,stand guard ... else platina catalyst easy to damage.Don’t put the oil on the platina fire point.Don’t use much oil,should be ...