Denon RC 853 is an advanced remote control unit that can be used to operate not only the Denon AVR-5700 but also other remote-control compatible Denon components. Some of the key features and possible use cases of this device include:

• Controlling multiple Denon components: The RC 853 can be used to control a wide range of Denon audio and video components, including CD players, MD recorders, tape decks, tuners, DVD players, and even some models of TVs and VCRs. This makes it a convenient and versatile remote control for home theater systems.

• Learning function: The RC 853 has a learning function that allows it to store the remote control signals of other manufacturers' components. This means that you can use the RC 853 to control all of your home theater components, even if they are not made by Denon.