The silent with function is adopted to eliminate mouse "clicking sounds". Noiseless bottom is adopted, which is ideal for use in a quiet environment. It is IR LED mouse using small infrared rays LED of power consumption. Because power consumption is smaller than mouse using Blue LED and laser, we can use without changing batteries for approximately 2.5 years. Interface: USB Connector type:USB(A)male Supported device: Windows PC, Macintosh equipped with USB InterfaceResolution:1200dpiCommunication method: GFSK Radio frequency:2.4GHzRadio wave outreach: When we use on one of magnetic material (including desk of iron): When we use on 3m, one of nonmagnetic material (including desk of tree): 10mReading method: Optical sensor method Output optical beam kind: Invisible wavelength area The number of the buttons:3 â»We include wheel button The number of the wheels:1Receiver storing:âContinuous operating:500 hours Continuous standby time: Approximately 1,041 days Estimated battery life: Approximately 905 days â»When we assign 5% during 8-hour PC operation a day to mouse operation Power supply (the body):AA alkali dry cell, AA manganese dry cell, either one of the AA nickel-metal hydride rechargeable. Voltage rating (the body):1.5VColor:BlackDimensions (Mouse):59.0mm in width X 99.8mm in depth X 39.0mm in height Weight (Mouse):Approximately 52 g â»We do not include battery Dimensions (receiver):18.0mm in width X 13.1mm in depth X 5.7mm in height Weight (receiver):Approximately 2gAccessories:AA alkali dry cell *1 for operation check, User manual *1LED color: Non-visible light (infrared rays)Supported OS:Windows 10ãWindows RT8.1ã8.1ã7(SP1)ãVista(SP2)ãXP(SP3)ãMac OS X 10.10ã10.11Dimensions classification: M size.