These products are SPD for co-axial connectors. In addition to this product, Sankosha has a range of other types that can match the required connector configuration and frequency characteristics, etc. Please feel free to contact us about your requirements. Category C2, Category D1 compliant RoHS compliant ・ Type: CX-「」 This is an SPD (surge protective device) for co-axial connectors that fits BNC type connectors and is used to protect monitoring cameras and other equipment connected via co-axial cables from lightning surge and other irregular voltage(CX-H for .high frequency co-axial lines using BNC connectors) ・ Type: B-「」 This is an SPD (surge protective device) for high frequency co-axial connectors using BNC connectors. ・ Type: N-「」 This is an SPD (surge protective device) for co-axial connectors used to protect high frequency co-axial lines using N type connectors from lightning surges.(N-JP-5 category C2 compliant) ・ Type: F-「」 This is an F type connector SPD (surge protective device) used to protect CS, BS, and TV tuners and other equipment from lightning surges induced by co-axial cables.