This mini diplexer can be used for separating signals as a splitter or combining signals as a combiner. Allows off-air signals and satellite signals to be fed on a single cable. DC power pass is provided from the satellite port to the input in order to pass satellite receiver LNB voltage. This device allows you to combine your local TV signal with your satellite signal and use only one wire. (Normally 2 of these are required) Works with Dish Pro Plus.