Keyboard Transmission mode2.4G wireless/10m working range. Key typeMembrane Key lifetime5 million times Multimedia hot keysYes Spill-resistant designYes Power supply modeAlkaline battery， 1 AA alkaline battery(Pre-installed) Battery life12 Month Product dimension435.75*157.01*29.73 (L×W×H mm) Mouse Transmission mode2.4G wireless/10m working range. SensorOptical DPI1000 ButtonsLeft button, middle button, right button Scroll wheel directionTwo-way Power supply modeAlkaline battery， 1 AA alkaline battery(Pre-installed) Battery life12 Month Product dimension118.5*62.7*40.2 (L×W×H mm) Design highlightsMultimedia hotkeys Spill-resistant design Long battery life 1000 DPI tracking engine Plug-and-forget NANO receiver Advantage / RecommendedEntry-level wireless combo, cheap, have basic functions，for the people who do not have too much performance requirements.