LIGHTSYNC RGB: Personalize lighting for each individual key, customize lighting effects, and enjoy in-game integrations from a spectrum of ~16.8M colors with Logitech Gaming Software. MECHANICAL SWITCH OPTION: Romer-G Linear is ideal for MMO and action games and provides a fluid and smooth keystroke. Linear actuation is great for double-tapping, rapid keystrokes in succession and uninterrupted half-presses. USB: Plug in your mouse, flash drive or phone with convenience via the integrated USB passthrough port. AL-MG: Aircraft-grade 5052 aluminum top case is anodized and brushed for a slim, premium design plus rigid durability. FULL FUNCTION KEYS: Enjoy the media and lighting controls right at your fingertips. Use the FN key to control volume, play and pause, mute, toggle game mode, change lighting effects, and much more!