Trump and Mini-Trump

Combines the powerful blast of the sound of a gas fog horn, with the simplicity of a mouth horn: delivers over 100 dB with no effort.
Operates on the vibration of a plastic diaphragm, which can easily be replaced with any thin plastic film.
Hard-wearing, colourfast, nature-friendly, and economical.
Virtually can't be lost, because it floats. The Mini-Trump is the more compact version.