Keyboard Transmission mode 2.4G wireless/10m working range. Key type Membrane Key lifetime 5 million times Multimedia hot keys Yes Spill-resistant design Yes Power supply mode Alkaline battery， 1 AA alkaline battery(Pre-installed) Battery life 12 Month Product dimension 435.75*157.01*29.73 (L×W×H mm) Mouse Transmission mode 2.4G wireless/10m working range. Sensor Optical DPI 1000 Buttons Left button, middle button, right button Scroll wheel direction Two-way Power supply mode Alkaline battery， 1 AA alkaline battery(Pre-installed) Battery life 12 Month Product dimension 118.5*62.7*40.2 (L×W×H mm) Design highlights Multimedia hotkeys Spill-resistant design Long battery life 1000 DPI tracking engine Plug-and-forget NANO receiver Advantage / Recommended Entry-level wireless combo, cheap, have basic functions，for the people who do not have too much performance requirements.