This Logitech RF wireless extender model C-RE4A is compatible with Logitech Harmony 890, Pro 1000, and 1100 remote controls. It allows you to extend the range of your remote control signals, so you can control your audio, video, and home automation devices from anywhere in your home or office. This device is perfect for those who want to control their devices without the need for line-of-sight between the remote control and the device. The Logitech RF wireless extender is a great addition to any home entertainment system that uses Logitech Harmony remote controls. It is easy to set up and use, and provides reliable and seamless control of your devices. With this device, you can enjoy the convenience of controlling your devices from anywhere in your home, without having to worry about the condition of your remote control or the range of its signals.