I use a Incredibel and it works great. I find many times peds can hear it from 40 feet back when it's fairly quiet. If it's very noisy, several rapid, loud rings from say 6 feet back always gets their attention. I always say a "thank you" when passing. Calling out is OK but I frankly I get tired of doing it when it's crowded like on the ped walk of the Golden Gate Bridge or Sawyer Camp trail and rather let my fingers hit the bell.