This system is commonly used in audio/ video distribution systems, where the source components are centrally located, or when you wish to control your source devices remotely from an entirely different location. Kit allows IR signals to be inserted onto a coax cable in one location and extracted from coax on another location. No extra wiring required it creates an IR system with existing wiring. Power-over-coax up to 4x IR receivers with the one power supply (included). Kit includes IR injector, IR coupler, Dual IR emitter, Mini stick-on IR receiver, 12V DC 200mA power supply.