Can Serve 2 Purposes (or both at the same time): #1) Can be used as a POE powered 2 Port POE switch #2) Can be used to extend your network cable run past the normal 300 meter distance limitation POE powered 2 Port switch: Has 1 port in and 2 ports out. Takes incoming POE through the in port and will act as a 2 port unmanaged POE switch through the 2 out ports to 2 more networkable devices. POE and/or Network Range Extender: Allows you to run cable lengths past the tradition 300 feet restriction. Daisy chain up to 2 extenders to run upwards to 900 feet