Punkman Wireless Mouse, Super-thin Touch Scrolling Wheel mouse Touch Scroll Wheel design, stylish and super-thin Built-in energy saving system: the mouse enter sleep mode when it is motionless; activate the mouse by only pressing the right or left button Wireless and ultra portable, 2.4Ghz wireless mouse, Compatible with Windows and Mac OS Nano-receiver hidden in the battery slot Battary type require to run by 2xAAA alkaline battery (Not supplied)