The DB9 RS232 Serial 9 Pin Male to RJ11 Female Adapter Converter is a blue adapter that allows you to connect a serial (RS-232) male connector to an RJ11 female connector. This 1:1 adapter converter is designed to simplify the process of connecting two different types of connectors in a computer network setup. With its reliable construction and easy-to-use design, this adapter is a valuable tool for those looking to expand their computer's connectivity options.