Noise Filter, noise suppressor, level converter Noise Filter,noise suppressor,level converterGround loop isolationSignal noise eliminationCylindrical metal case withheat-shrink tube20AMPSInput:30W And We have many other types, pls check our website, www.skyinternational.com.cn Here display some, NF-40WB AD-115 NF-116 If you are interested in our goods, pls feel free to contact us, thanks!