Question 45 - 47 refer to following paragraph:

Hello, welcome to the second tour place, President Lincoln’s house in historic Eagle’s Town. Before we start, let me give you some useful information. All tours in the house are self-guided and free of charge. (1) The special service we’ve started to provide all of you is that you can get headphones and cassette players for the selfguided tours (2) at the information booth. But if you would rather listen to the historical talk, please go to the back of the theater at the end of the main hallway. (3) The talk is presented every hour, and the next one starts in 5 minutes. We’ll meet back here in one hour.
45. What is the ‘special service’ they offer to tourists?