The 1M HomePNA Ethernet Adapter is designed to offer instant connectivity to multiple PCs over home's existing wiring. You can now take the advantages of inexpensive networking to your home or office, for HB2100 allows easy access to different devices sharing, Internet connections and multi-users gaming between PCs at the same time. Every standard telephone jack in the home is capable of hosting a PC-- you can connect up to 25 computers. This adapter is true Plug & Play. Thus transforming your telephone wiring into an expandable network is really easy and simple.