What are advantage and disadvantage of wired keyboard?

Advantages: no mess on the table, you can type in a distance (limited as far as the signal can handle), You can keep it in your locked cabinet from unwanted users. (Be sure you don't have any other computer with keyboard at home)

Disadvantages: You can loose the signal in a certain distance, The battery can be discharged in the middle of you rush work, project, assignment, YM, FB etc. and you forgot to buy a spare battery. (Solution: get a spare wired keyboard)