The Anker Ultra Slim Bluetooth Keyboard provides comfortable typing for your laptop, tablet or smartphone. It works equally well with iOS, Android, Mac and Windows, with shortcut keys optimized for all four systems. It is 30 percent smaller than traditional clunky keyboards and as light as a billiard ball (6.7oz). Save more space on your desk or in your bag! Enjoy quick, quiet typing on this comfortable keyboard. Shortcut keys save you time launching tasks or controlling media. With replaceable AAA batteries and power-saving mode, this keyboard lasts for more than 3 months at a time. This keyboard is not compatible with Mac OS X El Capitan.