we specialize Signal Surge Protectors ,including Audio Surge Protectors, Video Surge Protectors, network Surge Protectors, twisted pair Surge Protectors, Antenna Surge Protectors, handy phone Surge Protectors and so on. To protect the equipments phones, TVs computers and so on. the normal voltage is 5V,12V,15V,24V,48V,64V,110V,180V.rated discharge current is 0.2KA,5KA,30KA,Max discharge current is 0.25KA,10KA,50KA,protection level 1,2,3,6/ 4,5,7,8