logitech mx ergo wireless trackball mouse ? adjustable ergonomic design, control and move text/images/files between 2 windows and apple mac computers (bluetooth or usb), rechargeable, graphite, black logitech adjustable hinge for personalized comfortadvanced tracking and precision mode buttonprecision scroll wheel with tilteffortless multi-computer workflowfast rechargeable batterybattery life up to 4 months on a full chargeone minute of charge gives up to a full day of use