Browser-Based Speaker Tone Can Help Clear Water From Phone Grilles

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A developer rebuilt the water-ejection tone Apple Watch uses after swimming as a plain web page that runs on any phone without an app. The approach uses a 145–165 Hz sine wave played in short on-off bursts, since low pitches move the speaker cone more and pulsing keeps a droplet from settling. On iPhones, the page needs the Audio Session API so sound plays even when the silent switch is on, and the first tap must trigger audio directly for it to work. Vibration only works on Android, since Safari doesn't support the Vibration API. The author stresses that the tone only helps with water in the speaker grille and does nothing for water inside the phone, and that saltwater, pool water or sugary liquids can still cause residue or corrosion.

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