Check the listing for details. EXCELSUS DSL FILTER / BLOCKER / Z-BLOCKER / LINE CONDITIONER • WORKS PERFECTLY. Color: Beige, Condition: Open box. Listed at 3.84 USD. Excelsus DSL Filter / Blocker / Line Conditioner Use this to filter the DSL signal off your ordinary phone devices Keep your DSL signal pure and avoid DSL noise on your voice equipment DSL filters / blockers, which you plug in between voice phone equipment such as normal phones or answering machines and wall jacks where you're not using DSL. This will keep your DSL signal pure (potentially giving you more bandwidth and download speeds) and prevent the high-pitched DSL squeel on your voice devices. It also can prevent damage to your voice-only devices. I will offer a combined shipping discount on multiple qualities of these filter. In most cases, the 2nd, 3rd, etc item will ship at no additional shipping cost, but that may vary based on your location, especially for international shipments. See my other auctions. Click here. Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items.