Peace, mercy, and blessings of God be upon you. The keyboard has been used for 2 to 3 years. Some keys stick, like 'e', 'esc', and 'FN'. However, it's easy to remove the switch and place it in a less used spot. It has arrows and F1 to F12. When you press these keys, you must press FN, and most keyboards are like this. But honestly, the keys haven't been sticking lately. RGB system: First, the brightness. You can turn the brightness down or up, and there are more modes to decrease and increase the brightness. Second, the color of the lighting. You can set a color for the lighting, such as red, purple, green, white, or multi-colored. RGB modes: You can make it so that if you press the 'E' key, only that key's light turns on, or the entire row lights up gradually and fades out gradually. You can speed up or slow down the lighting speed for all modes, not just the brightness. You can turn it off, make it all flash, or have a wave effect for the lighting. You can connect it with the included piece or bring your own charger to connect it because its charger is lost, or connect via Bluetooth. You can also charge it. Reason for selling: I bought a new one.