This IR kit has everything you need to control your equipment. It includes a set-top IR receiver, a connecting block, power supply and four blinking mouse emitters. These parts are all that are necessary to control up to four components. This kit is intended for use in IR control systems where the equipment is hidden and does not have direct line-of-sight for IR control. Installation could not be easier; simply mount the connecting block near the equipment, plug in the emitters and attach them to the components, plug in the power supply, attach the IR receiver, and enjoy wireless control of all your equipment.