Verbatim Wireless Optical Notebook Mouse - 2.4Ghx, store-away receiver (96147) Battery Size Support: AAA, Design: Symmetrical, Dimensions: 1.25" Height x 2.13" Width x 3.75" Depth, Movement Detection: Optical, Pointing Device Connectivity Technology: Wireless, Pointing Device Host Interface: USB, Pointing Device Wireless Technology: Radio Frequency, Scroller: Scroll Wheel, Standard Warranty: 1 Year Limited Sold as 1 each