Can't use the MBA effectively at present. Index finger on one hand & middle finger on the other are taped up to cover/treat dermatitis, they are each half of the required fingers for scrolling on a trackpad. I have a Logitech mouse but the batteries are dead. They were OK a few weeks ago when last used. They came with the mouse & have been in it since new, Logitech claims a life of 12 months for alkaline cells in this mouse. I bought the mouse in October. In 2015. Not unreasonable, I guess. A Magic Moue would kill those cells in 3 weeks.