Deschem 1000ml,Electric Heating Mantle,1L,300W,Temperature Regulation Sleeves,North American Plug This Heating mantle use in 100-120 Voltage.It will smoking 30-60 Minutes first use.Them the inner sleeve become brown.Its normal and every new one like it. This Equipment Applies To Colleges, Petrochemical Industries, Medicine, And Environment Protection Institutions For Liquid Heating.It Adopts Heat Resisting Alkali-Free Glass Fiber As Insulating Material, And Seals Nickel-Chromium Alloy Resistance Wire Inside Insulating Layer, Then Weaves The Sealed Resistance Wire Into Hemispherical Internal Heated Heater.This Kind Of Heater Has Advantages Of Large Heating Area, Quick Heating-Up, No Flame, High Heating Evenness, Light Weight, Energy Saving, Safety And Less Destructiveness On Glass Apparatus.Technical DetailsCapacity: 1000mlHeating Power:300WMax. Temperature: 380℃Temperature Range: RT ~ 380℃Heating Mode: ContinuousVoltage: 100-120V 50/60Hz