We herein declare that the products that we manufactured are “DRC metal conflict-free”, the metal of gold(Au),tantalum(Ta),tungsten(W) and Tin(Sn) are not derived from or sourced from mines in conflict areas of the Democratic Republic of Congo(DRC), or illegally taxed on trade routes, either of whic

The shelf depreciation examination is the guarantee and a maintenance electrical power system normal operation important measure. The existing bureau puts in the examination method, the electromagnetism examination and the ultrasonic sensor wave examination are two kinds have the superiority examina

What is a mechanical buzzer? The mechanical buzzer is a special sub-category of the electromagnetic buzzer, which consists of an oscillator, an electromagnetic coil, a magnet, a casing and etc.The mechanical buzzer is always with high impedance, DC resistance is infinite, AC impedance is also very l