RAPOO X1800S 2.4GHz Wireless Optical Keyboard Mouse Combo Black - 1000DPI Nano Receiver 12m Battery - Reliable 2.4G wireless connection - Reliable 2.4G wireless connection up to 10 meters. - Plug-and-forget NANO receiver - So small and unobtrusive, you can plug it into a USB-port and forget about it. No more worries about lost receivers. - Mouse got updated to M10 wireless mouse - 1000 DPI high-definition tracking engine - You’ll enjoy responsive and smooth cursor control with the 1000 DPI high-definition invisible tracking engine. - Long battery life - With Rapoo\'s latest energy saving technology, you can use your keyboard for up to 12 months and mouse for 9 months without power interruption.