Built with an LED under each cap, the Thermaltake Poseidon Keyboards are fully back-lit and offer four levels of adjustable brightness via the Fn + F11/F12 keys. They come equipped with a Windows disable key to prevent accidental taps while gaming and an anti-ghosting function so that every stroke is as fluid as possible. In addition, the boards also come with multimedia keys to give you control your media player without exiting your current program.