My wife & I were on a tour in Israel last year in which the guide passed out hearing devices that allowed us to listen to him very clearly. We found that that makes a big difference, especially if the crowd is large enough such that one is not always near the tour guide when s/he is speaking.
We'll be in Germany in a month and are taking at least one Viator tour in Berlin, but I was wondering if folks' experiences is that these kinds of hearing devices are common on tours? We can ask Viator if this one provides them, but I was curious about tours in general, in Germany (well, be in Bavaria & Berlin for the most part). Thanks.