RAPOO 9900M Multi-mode, laser Keyboard Transmission mode 2.4G wireless, Bluetooth3.0, Bluetooth4.0 BLE Key type Membrane Key lifetime 5 million times Multimedia hot keys Yes Spill-resistant design No Power supply mode 2 AAalkaline battery(Pre-installed) Battery life 12 months Product dimension 433*168*23 (L×W×H mm) Mouse Transmission mode 2.4G wireless, Bluetooth3.0, Bluetooth4.0 BLE Sensor Laser Tracking Engine DPI 3200 Adjustable 600-3200 Buttons Left, middle, right, back, forward button, side scroll wheel, DPI switching button and device switching button Scroll wheel direction Two-way Power supply mode Lithium battery Battery life Approx. 30 days Product dimension 122*85*49 (L×W×H mm) Design highlights Intelligently switch among multiple devices Switch between Bluetooth 3.0, 4.0 and 2.4G Ultra-slim floating chiclet keys Precision on multiple surfaces Fully adjustable DPI sensor Eco-friendly rechargeable battery