Whistle

About this app

Need a referee whistle right now? Just take out your phone and hold the button.

Whistle turns your phone into a loud, responsive whistle:
it blows only while you hold, and stops the instant you release -
just like the real thing.

★ FEATURES
• Press-and-hold blowing with instant stop
• 8 whistle sounds: 2 included (Whistle, Ambulance) + 6 PRO
(Train Horn, Air-raid Siren, Emergency Bell, Vuvuzela, Rescue Whistle, Air Horn)
• TRIPLE blast and SOS emergency patterns
• Neon sound-wave visualizer that moves while the sound plays
• Volume control and favorites
• Korean / English

★ PRO SOUNDS
Unlock all 6 PRO sounds forever with a one-time purchase,
or open PRO for 24 hours by watching a short ad.

★ GREAT FOR
Referees and coaches, dog training, attention calls,
safety signaling and playing with kids.

★ NOTE
In a real emergency, always use official emergency services first.
Mind your surroundings and hearing at high volume.