Nordic Semiconductor's reference design for RF remote controllers offers non-line of sight operation, two-way data communication and 1-year plus battery lifetimes.

(Radio Frequency remote control) A handheld, wireless device used to operate audio, video and other electronic equipment using radio frequency (RF) transmission. Unlike the common infrared (IR ...

See Wi-Fi remote control. High-End IR Remote The MX-850 from Universal Remote Control transmits IR and RF simultaneously. High-end remotes such as this use multiple IR transmitters for broad coverage.

Most consumer remote controls operate using infrared light. This works well assuming the piece of equipment has a line of sight to the remote. But if you have, say a receiver in a cabinet or closet… ...