Genuine Asus GL550 chargers for powering your Asus ROG notebook or Asus gaming laptop, please check for your Asus GL550 notebook model, some models are referred to as ROG (Republic of gamers) models, always make sure your wattage is correct, if you are unsure please contact us as due to the high performance of these powerful notebook computers they need the correct power supply otherwise you cannot run your laptop GL550 to its maximum power.