Check the listing for details. DSL Micro Filter, DSL Filter, ADSL Filter, Plug in DSL Filter.. Condition: New. Listed at 3.00 USD. Corded DSL Micro Filter, DSL Filter, ADSL Filter, Plug in, No tolls Required If you have DSL internet you need these to allow the use of single line phones around your building. Requires 1 of these at each phone. If you have a wall mount phone see our other listings we have several of the style to work with them as well. If you buy more than 1 we will combine shipping in the same box on the same purchase for the same money, so buy 1 or buy them all for the same shipping From Mfgr.Features / Benefits • Capable to plug into any wall jack inside the premise which allows for greater flexibilityCustomer installed - no truck roll or craftsman required No tools required for installation.• UL-listed to U.S. and Canadian safety standardsLower first installation cost.• Provide uninterrupted ADSL service throughout Subscriber premiseNo dedicated ADSL jack.• Standard ash color - optional colors available upon request Corning Cable Systems' ADSL POTS Corded Distributed Micro-Filter is designed for use at the subscriber premise. ADSL represents Asymmetrical Digital Subscriber Line, which provides high-bitrate digital information over telephone subscriber lines. The term "POTS" means Plain Old Telephone Service. The POTS filter is a passive device, which allows only VOICE signals to pass through to the subscriber's phone, answering/fax machine, and other analog devices, while DATA signals pass onto the computer. This device easily plugs into any wall jack inside the subscriber's premise. No tools or wire terminations are required.