1.Conform to the IEC standard 2.Be made of selected quality materials, lastest design I entirety. 3. Good performance, low n 1.Conform to the IEC standard 2.Be made of selected quality materials, lastest design I entirety.3. Good performance, low noise, little vibration, and safety and reliable operation. 4..Nice appearance, light weight.5.Be maintained very conveniently, simple construction6. ...