... about 1500 hoursSurface temperature: 55ºC-70ºCHandy Warmer,it has a light surface,catch only by one hand ... ,good quality and treatment,use for many years.It is normal to use even temperature less than - ... to use:1.open the cover of warmer2.put it up lightly.Don’t touch platinum catalyst3.Put kerosene into ... is large, suitable for men, women, and children,it is a new keep warm good product.Notes:Please ...