The Lenovo 4X31S04838 is a wireless keyboard and mouse set designed to create a quiet and efficient workspace. You can connect these peripherals to your devices using either Bluetooth or a 2.4 GHz USB receiver, providing flexibility depending on your computer's available ports. The black membrane keyboard features both English and Russian layouts and is built for a silent typing experience, which helps you stay focused without distracting others nearby. Complementing the keyboard is an optical mouse tailored for right-handed users, though it is designed to be silent during use. It offers precise control with eight buttons and a scroll wheel, allowing you to adjust the tracking resolution between 1600, 2400, and 4000 dpi to suit your screen size or task. The set is powered by batteries, requiring one AA and two AAA cells to keep everything running. With its compact dimensions—the keyboard measuring roughly 433 x 123 mm and the mouse 113 x 61 mm—this kit fits comfortably on most desks for daily office work or home study.