Yamaha MRX-100 is a programmable remote control unit with learning capabilities. The device can learn and store commands from other remote controllers, allowing you to control multiple devices with a single remote. This is especially useful for simplifying the control of complex home entertainment systems.

The MRX-100 features 95 programmable keys, each of which can store a single command or a series of up to 15 commands. This allows you to create custom macros that can automate complex tasks, such as turning on multiple devices, switching inputs, and adjusting volume levels. The remote also includes three dedicated multi-command keys that can store up to 15 commands each, making it easy to control multiple devices with a single button press.