My AirZound Horn has served me well. I have used it more to deter dogs than in traffic situations.
Occasionally, I’ll return a friendly toot. On a recent tour, it took several long blasts to turn back a dog. Needless to say, had I been pursued by other dogs, I would have been reliant on speed–I’m not carrying water bottles. This week, I finally got around to installing a 2-liter bottle to replace my original AirZound bottle. Since I use this bike for long-distance riding, the additional air capacity extends my air-fill frequency. I covered the clear bottle with cloth (part of the sleeve of an arm warmer) because I think it looks better. I moved the bottle from my left-rear pannier to the left beneath-the-seat pannier [which is adjacent to the horn]. I did this to make more room for my sports drink in the left-rear pannier.