The Steren 300-146IV Telephone Surface Jack is a dual modular ivory RJ11 jack designed for use with telephones. It is a surface mount jack, meaning it can be mounted directly onto a wall or other surface. The brand of the jack is Steren, a well-known manufacturer of electronic components. The connector A is RJ-11, which is a standard connector used for telephone connections. This product is ideal for those who need to connect their telephone to a wall jack.