The Dell KM555 in Black is a wireless keyboard and mouse combo designed for versatile productivity across various operating systems, including Windows, macOS, ChromeOS, and Linux. You can connect the peripherals using either Bluetooth 5.1 or a 2.4 GHz RF connection via the included Dell Secure Link USB receiver, allowing you to switch between devices easily. The keyboard features quiet plunger switches and a spill-resistant design to handle accidental splashes during work. It includes programmable keys and dedicated multimedia hotkeys for controlling volume, playback, and accessing CoPilot, while an adjustable tilt helps you find a comfortable typing angle. Measuring 399 x 127 x 26 mm and weighing 406 g, it remains portable yet stable on your desk. Accompanying the keyboard is a symmetrical optical mouse in Black that fits comfortably in either hand. It offers a resolution of up to 4020 dpi for precise tracking across different surfaces and features three buttons in a compact 105 x 60 x 38 mm frame weighing just 67 g. The set runs on battery power, using two AAA batteries for the keyboard and one AA battery for the mouse.