Please also check out my latest design, a Long Range Dog Whistle at 7,000 Hz. Please download here.

I have also developed real Ultrasonic dog whistles at 20,000 Hz and above, which you can find here.

Description

I needed a load and compact whistle to fit my keychain and couldn't find any design which fits my requirements. What I found was either too bulky, too fragile, or too quiet.

So I made my own design, and this are the key advantages:

• extremely loud for it's size,
• very compact, only 5 mm thick, 14.3 mm wide and 48.9 mm long,
• double tone, sounds similar to a referee's whistle,
• easy to blow,
• sturdy and hard to destroy,
• lean design,
• easy to print,
• fast printing and little filament required (approx. 2.5 grams).