【Plug & Play 2.4G Wireless Connection】One 2.4 GHz USB receiver can connect both the keyboard and mouse, can also be used separately, plug & play, no need to download any software. 2.4 GHz wireless provides a powerful and reliae connection up to 33 feet(10m) without any delays.(Wireless USB receiver is at the bottom of the mouse). No Delay, No Dropout. 【Power Saving Extends Battery Life】After 10 minutes of inactivity, the wireless keyboard mouse combo will automatically go into sleep mode to save energy. The keyboard requires two AAA battery, and the mouse requires one AA. 【Silent Wireless Mouse】Computer mouse provides whisper silent click, no need to worry about disturbing others to rest while working or playing. DPI adjustae mouse provides 3 levels of DPI (800/1200/1600) to meet your different needs in terms of sensitivity. 【Compatie wireless mouse and keyboard combo】Includes a full-size keyboard and a high-sensitivity mouse. Works with your PC, Desktop, Laptop or Notebook. Compatie with Windows XP / Vista / 7 / 8 /10 operating systems. 【Power indicator】the new battery into the keyboard and mouse, if the normal connection with the computer power red light will flash 5-8 seconds off, if the computer is not normally connected to the power red light on for a moment on off. Low battery mode is to press any key power red light will flash. So when you first start using, the power red light keeps flashing for 5-8 seconds is normal.