This device prevents ADSL (Asymmetric Digital Subscriber Line) signal from disturbing telephone or fax machine, while simultaneously reducing noise and enhancing signal quality. Unit functions as a filter only (no DSL output). It creates clearer voice communications and prevents interference by removing high frequency ADSL transmissions from phone signals. The filter isolates low-frequency voice signals to ensure the cleanest network performance with fast, error free data transfers.
Product is as advertised. Delivered in timely manner. Very satisfied.