To avoid injury from or electric shock,please ensure compliance with safety instructions when using this device.Please read the instruction carefully and make sure that you have understood it well.Keep the manual near the equipment to be able to read it at any time.Always use current sources co-nnected to the ground and providing the necessary voltage (indicated on the label on the device).If you have any doubt,let an electricien check that unit is propetly grounded.Never use a damaged power cable.Do not open the unit of solar radiation.Use the device in a protected location to avoid damaging the equipment or endangering others.Make sure the device is able to cool after 3 hours constant working.and avoid placing it too close to other devices that produce heat.Before cleaning,disconnect it.Use a soft damp cloth for cleaning.Avoid using detrgent and make sure that no liquid enters the unit.If the metal contains acid or alkali materials,which may have chemical reaction to corrode heating element,in this way,please keep the top cover open during melting process. No internal element of this device needs to be maintained by the user. An opening of the device without our approval leads to a loss of warranty.