The A4TECH Bloody B760 USB Full Light Strike Neon Backlit Gaming Keyboard features LK Optical Switch that reacts at lightning speed without lag. Innovative LK Optical Switch technology uses an optic switch to react at lightning speed with extreme 0.2ms key response, exclusive "long-lasting" typing sound, and tactile feedback creates more passion for gamers. It uses World's first Lightning Speed Mechanical Switch. It comes with an adjustable Neon Glare System. Press Fn + F12 to turn on / off the backlit and Press Fn + ↑ / ↓ to adjust the light brightness. Full N-Key Rollover ensures each keypress can simultaneously register regardless of how many keys are being pressed or held down at a time including modifier keys. (Shift, Control, and ALT). The keyboard has Screw Enhanced Space-Bar. Dual screws + dual springs + balancing bar equals to stronger durability. Featuring a Metallic aluminum alloy surface, durable and long-lasting, The A4TECH Bloody B760 is a perfect keyboard for gamers. The A4TECH Bloody B760 USB Full Light Strike Neon Backlit Gaming Keyboard has a 1-year warranty.