... : 6 second. oil consumption 1-1.5ml/hour.Use:keep warm to leave cold,it suits common life when weather turn cold ... can be work to keep warm 20-24 hours when you add oil one time.Safety,no toxic, environmental protection.How to use:1 ... as improve respiratory tract illness,improve sleep,etc.Keep warm:suits for that go to school,travel,outdoor work,work on night ...