Lefties rejoice, the MasterMouse PRO L is ambidextrous and not the pretend kind that features just two side buttons. It has a total of 8 programmable buttons and features the Storm Tactix Function (Labelled TX) which means you have a second layer of programmable buttons once activated to increase the total to 14 programmable buttons. It has on-board 512kb memory, and a 32bit ARM processor. The MasterMouse PRO L also features 16.7m customisable lighting with some advanced effects that is supported by the flashy new software from Cooler Master.