The MX-850 offers Radio Frequency (RF) operation that provides up to 100' range though walls, floors and doors, indoors or outdoors. Self-adhesive emitters affix to the infrared sensors on the front panels of your components. The emitters relay IR commands to components out of sight to the MRF-250's/MRF-300's RF base station front blaster. The emitters plug in to the MRF-250's/MRF-300's RF base station rear flasher line outputs via their 10 foot cables. Six flashers with visual feedback are included with each MRF-250/MRF-300 RF base station. The MX-850 can be programmed to operate equipment placed throughout the house, by installing an MRF-250 or MRF-300 RF base station at each location. The MX-850 controls up to 20 components. Each of the 20 components can be programmed with up to 4 pages of LCD screens, plus the 33 hard buttons. The MX-850 allows edit of the text on each LCD screen to preference (up to 26 screens with 10 buttons per screen, for a total of 260 available text buttons and up to 5 characters per button). The powerful memory of the MX-850 offers up to 912 potential macro buttons. Each of these macros can play back recorded sequences of commands that completely automate a complex system with one touch. A macro can record and play back up to 190 steps with time delays between steps when desired.