This product is a dual-mode keyboard and mouse combination setthat supports Android, Windows, and 1OS systems (FN+Q; switches to 1OS system, FN+W: switches to Android system, FN+E: switches to Windows system), and has One 2.4G wireless mode and Two Bluetooth wireless modes. The keyboard and mouse have built-in 3.7V lithium batteries. The keyboard and mouse share a single 2.4G USB adapter. The mouse DPI is divided into three levels, respectively 800/1200/1600.The default setting is 1200 for first time use. Switch in sequence by short pressing DPI.After the mouse is powered off and restarted, the current setting will automatically be saved to memory. Specification: 2.4Ghz wireless 3.0/5.0BT keyboard:Lithium ion battery 180mAh mouse: Lithium ion battery 500mAh DPI: