Specifications are provided by the manufacturer. Refer to the manufacturer for additional explanations. Basic Product Type: Mouse Movement Detection: BlueTrack Brand Name: Microsoft Pointing Device Connectivity Technology: Wireless Pointing Device Wireless Technology: Bluetooth Number of Total Buttons: 3 Scroller Type: Scroll Wheel General Information Product Type: Mouse Manufacturer Part Number: ELH-00005 Manufacturer Website Address: http://www.microsoft.com Manufacturer: Microsoft Corporation Product Name: Modern Mouse Product Line: Modern Brand Name: Microsoft Miscellaneous Package Contents: Modern Mouse 2 x AAA alkaline Batteries Wireless Receiver Physical Characteristics Weight (Approximate): 91 g Height: 33.5 mm Width: 64 mm Depth: 115.1 mm Pointing Device Movement Detection: BlueTrack Pointing Device Connectivity Technology: Wireless Pointing Device Wireless Technology: Bluetooth Number of Total Buttons: 3 Scroller Type: Scroll Wheel Warranty Limited Warranty: 1 Year