Pesp Ultra-thin Intelligent Smart Adjustable Blue LED Backlight Multimedia Wireless Gaming Keyboard with USB Receiver for PC Laptop It is an ultra-thin blue backlight wireless mute keyboard. Intelligent Hands Recognition Technology. Backlight brightness adjustable, by press " Fn+F5/F6" to adjustment. With mini USB receiver, plug and play. With 13 multimedia control keys, to help manage your music, web, and video.