▶PLUG and PLAY: H9 Pro rainbow backlit wireless keyboard and mouse with touchpad is connected by a high stability powerful 2.4ghz wireless radio frequency technology, just plug USB dongle, the transmission distance can up to 50ft ▶RAINBOW BACKLIT SET: The latest LED Backlit Panel technology, over 180000 colors of backlit for you to choose, and can be turned off. Also this keyboard have a light memory function, no need to reset it when power on each time. ▶TOUCHPAD: With the DPI adjustable functions,the touchpad can better match the different sizes of screen, also it supports multi-finger function,you can use single finger or two-finger to control your device, easily browse the internet and play games.