KENSINGTON ExpertMouse WirelessTrackball 80004518 K72359WW Product Description: Kensington Expert Mouse Wireless Trackball - trackball - 2.4 GHz, Bluetooth 5.0 LE - black Device Type: Trackball Connectivity Technology: Wireless - 2.4 GHz, Bluetooth 5.0 LE Colour: Black Orientation: Right and left-handed Wireless Receiver: Nano Bluetooth USB adapter Movement Detection Technology: Optical Buttons Qty: 4 Features: Removable wrist rest, DiamondEye technology, scroll ring, power saving automatic sleep function, Bluetooth 3.0 Compatible Battery: AA type OS Required: Microsoft Windows 7 or later, Apple MacOS X 10.8 or later, Google Chrome OS 44 or later Manufacturer Warranty: 3-year warranty