This thing worked great on the back of a Blackhawk and it's still working great even stateside on the back of an ambulance. Even works well in loud environments like nightclubs and next to freeways. Plus it's lightweight and highly resilient. What can you say, it's probably the most bang for your buck Littmann on the market. Big time acoustics difference from it's competitors. As a matter of fact, it served it's purpose so well, my little brother took it with him to medical school. I have to get me another. Over 4 years old and it still rocks!