The Marantz RX-77 RF extender receives RF (radio), rather than IR infrared, sent from your compatible remote control. It can be hidden anywhere, including a closed cabinet, or even in another room!. The signals received from your remote then fires 4 IR flasher ports to control your equipment. Same as the Pronto RFX6000 This is an Open Box. The extender and flashers have never been used (the extender is still covered by protective film). The power supply has been used and is verified to be working. Compatible with Marantz remotes RC9200, RC9500, RC5400, and RC5000i; and Philips Pronto and Pronto Pro NG remotes such as TSU-2000, TSU-3000, TSU-3500, TSU-6000, TSU-7000 and more. Please make sure that your remote is capable of transmitting RF before the puchase. Includes everything you see in the picture, including the extender unit, power supply, 4 IR flashers, and manual.