ERGONOMIC WAVE DESIGN - The MK550 uses Logitech's Constant Curve layout for reduced stress and better, more natural typing. The layout is familiar, so there is little to no learning curve to begin using it fluidly INTEGRATED PALM REST - Experience lower wrist fatigue with the integrated palm rest , Three options for leg height allow you to adjust the keyboard to the height that feels most comfortable to you. PRECISION-LASER MOUSE - Say goodbye to your touchpad with the included MK510 precision-laser mouse

BROTHER GENUINE CARTRIDGE - Brother TN-660 is a Brother Genuine cartridge that produces mono laser prints in high quality you can depend on. YIELDS UP TO 2,600 PAGES -This replacement high-yield black toner cartridge can print approximately 2,600 pages(1). SEAMLESS INTEGRATION - This professional replacement black toner cartridge creates rich blacks and is engineered to work in seamless unison with your Brother laser printer.