Characteristic 1. Professional soldering tools. 2. The whole product is made of environmental protection materials, no pollution. 3. Using the heating wire, more durable, more longevity. 4 .Good grounding, safe and reliable. Matters needing attention: 1. Is used for the first time if there is smoke coming out of a normal phenomenon, smoke will disappear naturally after a short time. 2. Using electric iron base to avoid personal injury or burns. 3. Iron cooling do not replace the tip. 4 .Please use natural cooling to iron. 5 .Don't be close to other mechanical iron. Notices: 1.It is a normal phenomenon that produce smoke when you are using this product, please do not worry. Suggest use in a well ventilated space. 2.Please use a work glove or pliers to replace tips. 3.The metal tips will become crisp and easy to break in the high temperature, please waiting the temperature drop down then replace. 4.When the iron head is oxidized to black, use emery to clean it firstly, then turn on power for heating, then put on tin immediately. This method can clean the oxide. 5.The sponge need to use with water. The optimum condition of a sponge is that pinch sponge without water but wetness. The function of sponge is to collect tin slag.