If you’re not purchasing a cordless cup warmer, then yes, the length of the cord does matter. The cord needs to be long enough to plug into a power supply and allow for the base to sit wherever it is you’d normally place your coffee cup. There is no point in buying a cup warmer only to discover you can’t use it where you normally drink your coffee. To be absolutely certain the cord is long enough on the cup warmer you purchase, it's worth measuring the distance from your nearest power supply to where you want the cup warmer to sit. This will avoid any disappointment.