I frequently get compliments and thanks when I approach pedestrians from behind and ring my bell. Before I had a bell, I said "behind," "on your left/right," etc, but more often than not, people would be startled and move erratically in response to my voice. I find that they now immediately recognize the bell, move aside, and are generally more calm and predictable in comparison. I have an electronic horn to alert motorists in traffic.
I use this bell.
Bell TransIt Dingo Bell
It sounds like this.
I have this electric horn.
Amazon:
https://smile.amazon.com/DAWAY-Loud-..._aya_orig_subj
ebay(example):
Cycling Horns Electronic Bike Bicycle Handlebar Ring Ultra Loud Alarm Bell JL | eBay
It sounds like this (Play the video.).
https://smile.amazon.com/gp/customer...SIN=B01A7Y5EEK