The two colors of ABS particles are melted and the characters are not faded. The texture of the key cap is delicate. When the keyboard is not resting for more than 5 minutes, the keyboard automatically turns off. Adopt ergonomic streamline high and low key position layout, adapt to the human hand tapping the keyboard movement arc, feel comfortable! Only charge twice a year, keyboard: built-in 4000mAh battery, mouse: built-in 800mAh battery System support: Widows XP, Windows 7,Windows 8, Win10, Macintosh, OS2 2.0 more than This keyboard & mouse connect to the computer through USB receiver, USB receiver is put in the bottom of mouse, plug into to idle USB port of your computer (turn on the switch of keyboard & mouse), they can work, partial computers need to pair keyboard & mouse at the first-time use, please read user manual and pair them at your first-time use.