2. Warranty: 5years warranty for our product surge protection device. 3. a.Cerfificates: CE,Rohs, TUV,UL,CQC, ISO9001,ISO14001,OHSAS18001 b.Testing reports: We can provide testing reports issued by an authority c.Patents: we have 24 patents for technology and appearance/ 4.We have our own lab and professional R&D team.OEM and ODM are available. 5. Excellent parameters reasonable prices. 6. Sample can be provided if need.