Peace, mercy, and blessings of God be upon you. Logitech keyboard 513, I guarantee it, it has nothing wrong with it. It just needs cleaning because I only used it for a month and a half, and the rest of the time it was in a drawer. The keyboard, I guarantee it, it has nothing wrong with it at all, it's very sound + I bought it for 800 and selling for 500, and I'll be flexible with the serious buyer, God willing.