The ADSL Broadband Splitter-Filter is a device that allows you to connect your ADSL modem and telephone to a single phone line. It features two RJ11 ports, which are commonly used for connecting telephones and modems. The splitter-filter separates the high-frequency ADSL signal from the low-frequency voice signal, ensuring that your internet connection remains stable and your phone line remains clear. This device is easy to install and is compatible with most ADSL modems and routers. It is an essential accessory for anyone who wants to enjoy high-speed internet and reliable phone service at the same time.