Rapoo 9900M Advanced Multi-mode Wireless Ultra-slim Alloy Combo Set - Black Intelligently switch among multiple devices The keyboard and mouse intelligently connect to the working device. They can separately connect to up to 4 devices, and switch among them with ease. They simplify complicated cross-platform use and meet multi-tasking requirements. Switch between Bluetooth 3. 0, 4. 0 and 2. 4G The smart switch between Bluetooth 3. 0, 4. 0 and 2. 4 GHz ensures stable wireless transmission. You can still use the combo regardless of USB port shortage or the loss of receiver. Ultra-slim floating chiclet keys 4. 0mm at thinnest, stainless steel base and aluminium alloy panel, bring you comfortable tactile; The accurate scissor key structure allows you to press the buttons with ease. Precision on multiple surfaces The high-performance laser engine enables you to use the mouse on multiple surfaces. Enjoy a high-speed response and unrivalled accuracy. Fully adjustable DPI sensor Precise down to the last pixel: with the adjustable DPI sensor, accuracy is no longer left to chance. Adjustable from 600 DPI to 3200 DPI, you can adapt it to match your preference. Eco-friendly rechargeable battery Thanks to the built-in eco-friendly lithium battery of the mouse, you can enjoy long battery life with a full charge. It eliminates the need for often replacing batteries.