What a fantastic tour! When it asked me to download an app, I was skeptical. "Great, yet another app to bloat up my phone." But it was ABSOLUTELY worth it. Such a cool piece of tech. Ideal to use wireless headphones. My wife and I each shared one earbud. We started at the start point, and it used GPS to track us as we walked, so I was able to keep my phone in my pocket and we were guided through the tour without any issues, and the guide not only shares about the history of the houses, but also directs you as you walk, and tells you where to look/what to look out for. Very cool!