Plus, the MRF-250 and MRF-300 RF base stations make it possible to control up to six identical components (e.g. TVs, VCRs, CD players) by routing commands only to the device selected by the MX-850. As for the MX-850 itself, it is designed for handling up to 20 components within a 100’ range through walls, floors, and doors. Most notable about the MX-850 is its extensive memory, which offers up to 912 potential macro buttons, each capable of processing 190 consecutive steps. The Universal Remote MX-850 retails for $329.95 and comes with a 1 year limited warranty.