They require either 2 AA alkaline batteries or 2 AAA alkaline batteries.
IR replacement remotes are plug-and-play — no pairing required. Insert the specified batteries and point the remote at the TV to use it.
Common functions include power on/off, input/source switching, volume and channel control, navigation for menus and smart TV apps, and dedicated buttons such as My Apps, Menu, Home, Widgets, and Emplink.
Some listings explicitly exclude features such as voice commands and air-mouse/pointer functionality; other remotes note they don't support RF pairing or include a QWERTY keyboard.
Some remotes include a USB receiver dongle and printed pairing instructions. Batteries are generally required but often not included in listings.